These are the conjectured smallest Sierpinski/Riesel numbers for bases ≤1000, also the square bases ≤402 and the power-of-2 bases ≤210
Base 1E4 has the largest CK for all bases ≤1000, and it has been conjectured that base 1E4 has larger CK than ANY other base, and it is interesting to see if there were any CK > base 1E4's for bases >1000. Didn't take much searching, base 1254 has a much larger CK than base 1E4, S1254 has CK=X93X0883679XE07, and R1254 has CK=54X8E4X3X13E1042
The smallest CK for all bases ≤1000 is 4, and the smallest odd CK for all bases ≤1000 is 11, and it has been conjectured that 2 and 3 can never be Sierpinski/Riesel number to any base, but this conjecture is not true, 2 is Sierpinski number base 110X9695X887X2X75 (and now it is conjectured that this is the smallest base such that 2 is Sierpinski number), however, 3 can never be Sierpinski number, and 2 and 3 can never be Riesel number, in general, numbers of the form 2^r−1 can never be Sierpinski number, and numbers of the form 2^r+1 can never be Riesel number.
| k | conjectured smallest base such that k is Sierpinski number | conjectured smallest base such that k is Riesel number |
| 1 | (none) | (none) |
| 2 | 110X9695X887X2X75 | (none) |
| 3 | (none) | (none) |
| 4 | 12 | 12 |
| 5 | 3XEE2278 | (none) |
| 6 | 2X | 2X |
| 7 | (none) | 1938686132 |
| 8 | 18 | 18 |
| 9 | 86X40 | (none) |
| X | 28 | 28 |
| E | 12 | 12 |
| 10 | EX | EX |
Note that 2, 5, and 9 are not Sierpinski numbers for small bases, and 7 is not Riesel number for small bases (1, 3, and 7 are not Sierpinski numbers for any base, and 1, 2, 3, 5, and 9 are not Riesel numbers for any base), besides, all small bases with E is Sierpinski or Riesel number are == 12 mod 13, and in these bases 4 is also Sierpinski or Riesel number, thus E cannot be the CK for small bases.
Bases 2 to 100[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 2 | 39565 | 206817 |
| 3 | 2029E39E01X | 1028027E722 |
| 4 | 32759 | 1E143 |
| 5 | 78702 | 148842 |
| 6 | 84X58 | 41013 |
| 7 | 15E77XXX7X70 | 670E5X1X7X2 |
| 8 | 3E | 12 |
| 9 | 1434 | 62 |
| X | 5387 | 5X80 |
| E | X42 | 5EX |
| 10 | 375 | 274 |
| 11 | E0 | 212 |
| 12 | 4 | 4 |
| 13 | X292X07695290 | 40E498E248436 |
| 14 | 32759 | 177X5 |
| 15 | 1E2 | 72 |
| 16 | 292 | 186 |
| 17 | 30X986 | 4600X2 |
| 18 | 8 | 8 |
| 19 | 6E6 | 3X8 |
| 1X | 3X5X | 26E9 |
| 1E | 132 | 338 |
| 20 | 158X3 | 16868 |
| 21 | 107EX6 | 148842 |
| 22 | 165 | 105 |
| 23 | 38X | 570 |
| 24 | 2776 | 5306 |
| 25 | 4 | 4 |
| 26 | 603 | 2X28 |
| 27 | 2168X40 | 65E66 |
| 28 | X | X |
| 29 | 10X6 | 538 |
| 2X | 6 | 6 |
| 2E | X3X2X | 11X704 |
| 30 | 1112 | 57410 |
| 31 | 1610 | 45E8 |
| 32 | 12 | 11 |
| 33 | 80186 | 552872 |
| 34 | 33X351 | 1173959 |
| 35 | 8 | 8 |
| 36 | 78X4 | 8915 |
| 37 | 1380 | 480 |
| 38 | 4 | 4 |
| 39 | 26E42 | 11084 |
| 3X | 8814 | 4895 |
| 3E | 8 | 12 |
| 40 | 857 | 1X4X |
| 41 | 1854 | 1492 |
| 42 | 14 | 14 |
| 43 | 189E912 | 2X8381X |
| 44 | 14716 | 418EE |
| 45 | 117X | 3154 |
| 46 | 19 | 19 |
| 47 | 2680 | 3E70 |
| 48 | 18 | 18 |
| 49 | 830 | 100 |
| 4X | 20E13 | 51278 |
| 4E | 4 | 4 |
| 50 | 9991 | EX92 |
| 51 | 8940 | 7978 |
| 52 | 8 | 8 |
| 53 | 106E7610 | 5286734X |
| 54 | 43 | 12 |
| 55 | X | X |
| 56 | 717X8E7 | 2X189730 |
| 57 | X746 | 19X0 |
| 58 | 1X | 1X |
| 59 | 6 | 6 |
| 5X | 64E1 | 36X8 |
| 5E | 119199X7X2 | 277156EX8 |
| 60 | 50E | 205 |
| 61 | X04 | 2X0 |
| 62 | 4 | 4 |
| 63 | 2446 | 2446 |
| 64 | 37 | X0 |
| 65 | 12 | 12 |
| 66 | 8E863 | 4414E |
| 67 | 8X8484 | 7X9890 |
| 68 | 727 | 191 |
| 69 | 3618 | 62 |
| 6X | E403 | 10E06 |
| 6E | 8 | 8 |
| 70 | 14 | 14 |
| 71 | 97EX0X4X | E1575740 |
| 72 | 24 | 24 |
| 73 | 1XX | E64 |
| 74 | 2451 | 5746 |
| 75 | 4 | 4 |
| 76 | 23 | 23 |
| 77 | 43X16 | E0682 |
| 78 | 28 | 28 |
| 79 | 1214X | 430 |
| 7X | 33 | 33 |
| 7E | 1EE22 | 1552 |
| 80 | 1503E5 | 1X697 |
| 81 | 9310 | 13302 |
| 82 | X | X |
| 83 | 490 | 100 |
| 84 | 1519 | 526 |
| 85 | 14 | 9X |
| 86 | 205 | E43 |
| 87 | 7E96 | 806 |
| 88 | 4 | 4 |
| 89 | 89140 | 82892 |
| 8X | 1EX616 | 6653E3 |
| 8E | X2 | 492 |
| 90 | 13252 | 7912 |
| 91 | 2X | 100 |
| 92 | 32 | 32 |
| 93 | 12104 | 6E56 |
| 94 | 203X | 2283 |
| 95 | 7X | 18 |
| 96 | 20 | 20 |
| 97 | 24996 | 39846 |
| 98 | 21 | 12 |
| 99 | 1320 | 3880 |
| 9X | 59 | 42 |
| 9E | 4 | 4 |
| X0 | X5666415 | 47971584 |
| X1 | 260 | 1XX6 |
| X2 | 34 | 12 |
| X3 | 12X2 | 10X |
| X4 | 4X15E57X | 12EX9X9 |
| X5 | 8 | 8 |
| X6 | 30E838 | E15399 |
| X7 | 22211X8E56 | 16247871726 |
| X8 | 38 | 38 |
| X9 | 12 | 12 |
| XX | 413201 | 99X1E5 |
| XE | X | X |
| E0 | 11 | 18 |
| E1 | 1160 | 2170 |
| E2 | 4 | 4 |
| E3 | 788 | 1974 |
| E4 | 44599 | 44599 |
| E5 | 1X | 1X |
| E6 | 1739 | 1066 |
| E7 | 6 | 6 |
| E8 | 3X | 3X |
| E9 | 375283E0 | 229857932 |
| EX | 10 | 10 |
| EE | 44E8 | 862 |
| 100 | 4E | 4E |
Bases 101 to 200[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 101 | 189156 | 104XE8 |
| 102 | 8 | 8 |
| 103 | X476 | 3X330 |
| 104 | 2707 | 3026 |
| 105 | 4 | 4 |
| 106 | 24496 | 24496 |
| 107 | 40270 | 14X602 |
| 108 | 14 | 14 |
| 109 | 2X | 2X |
| 10X | 51 | 160 |
| 10E | 12 | 12 |
| 110 | 36982X0574 | 4XE8E77E1 |
| 111 | 940 | 2082 |
| 112 | 44 | 44 |
| 113 | 30 | 370 |
| 114 | 1X | 133 |
| 115 | 1028 | 19XX |
| 116 | 3701 | 1X77 |
| 117 | 2514 | 270 |
| 118 | 4 | 4 |
| 119 | 187X | 45X |
| 11X | 69697 | 61E22 |
| 11E | 8 | 8 |
| 120 | 5424 | 28E4 |
| 121 | 14 | 136 |
| 122 | 18 | 18 |
| 123 | XX5X | 55332 |
| 124 | 90 | 892 |
| 125 | 24 | 24 |
| 126 | 6 | 6 |
| 127 | 14E237400 | 79311E20 |
| 128 | 4X | 4X |
| 129 | 2140 | 1X4 |
| 12X | E01 | 73 |
| 12E | 4 | 4 |
| 130 | 690053 | 26X1386 |
| 131 | 9X | 210 |
| 132 | 1E | 52 |
| 133 | 724 | 154 |
| 134 | 30 | 30 |
| 135 | 28 | 28 |
| 136 | 57 | 57 |
| 137 | 566 | 2058 |
| 138 | 8 | 8 |
| 139 | 48 | 48 |
| 13X | 1078833 | 262925 |
| 13E | 212 | 198 |
| 140 | 4687 | 8061 |
| 141 | 8446 | 3X916 |
| 142 | 4 | 4 |
| 143 | 80E06002 | 1430X5594 |
| 144 | XE7EX6 | 8X9X4E |
| 145 | X | X |
| 146 | 2461 | 2152 |
| 147 | 77X0 | 77X0 |
| 148 | 3E | 58 |
| 149 | 166601X | 128E492 |
| 14X | 49 | 49 |
| 14E | 14 | 12 |
| 150 | 69 | 69 |
| 151 | 68076 | 29E6080 |
| 152 | 1X | 1X |
| 153 | 5556 | 1X3X4 |
| 154 | 109 | 48 |
| 155 | 4 | 4 |
| 156 | 41617747 | 22X26478 |
| 157 | E866 | 2E16 |
| 158 | 5X | 5X |
| 159 | 24EX | 386 |
| 15X | 123 | 38 |
| 15E | E644 | 8X7X |
| 160 | 78 | 78 |
| 161 | 10X6 | 2868 |
| 162 | 62 | 62 |
| 163 | 2X | 2X |
| 164 | 87 | 230 |
| 165 | 32 | 32 |
| 166 | 1693X7 | 43296 |
| 167 | 2955X | 277X8 |
| 168 | 4 | 4 |
| 169 | 57E3X | 812X8 |
| 16X | 627630 | 7783E |
| 16E | 18 | 18 |
| 170 | 7E6 | 9812 |
| 171 | 20 | 20 |
| 172 | 8 | 8 |
| 173 | 101830 | 73880 |
| 174 | 197034 | 202209 |
| 175 | 12 | 12 |
| 176 | 3X | 3X |
| 177 | 910X | 3142 |
| 178 | 68 | 68 |
| 179 | 42 | 42 |
| 17X | 1X68769 | 19919E9 |
| 17E | 4 | 4 |
| 180 | 6E0777 | EX4X90 |
| 181 | 268124 | 9266 |
| 182 | 8 | 12 |
| 183 | 1E23X | 6X74 |
| 184 | 6 | 6 |
| 185 | 34 | 34 |
| 186 | 65 | 65 |
| 187 | 35394 | 1X7628 |
| 188 | 6X | 6X |
| 189 | 588 | 8300 |
| 18X | 1X10951 | 28X975 |
| 18E | 8 | 8 |
| 190 | 39 | 39 |
| 191 | 1258X | 1128 |
| 192 | 4 | 4 |
| 193 | 53866 | 9X792 |
| 194 | 859 | 5EE8 |
| 195 | 38 | 38 |
| 196 | 30 | 30 |
| 197 | 100 | 12 |
| 198 | 24 | 24 |
| 199 | 2E62470 | 445X606 |
| 19X | 540E0 | 139E3 |
| 19E | X | X |
| 1X0 | 46 | 46 |
| 1X1 | 186 | 18 |
| 1X2 | 74 | 74 |
| 1X3 | 549260 | 591106 |
| 1X4 | 49XX | 940 |
| 1X5 | 4 | 4 |
| 1X6 | 2EXE8 | 10669 |
| 1X7 | 4853EX36 | 14X60378 |
| 1X8 | 8 | 8 |
| 1X9 | 2372 | 4252 |
| 1XX | 19 | 19 |
| 1XE | 1X | 1X |
| 1E0 | 260435 | 62X3XE |
| 1E1 | E3E6 | 4128 |
| 1E2 | 8 | 12 |
| 1E3 | 6 | 6 |
| 1E4 | 924XE44391X56 | 49731795912E69 |
| 1E5 | 3X | 234 |
| 1E6 | 6307 | E0XE |
| 1E7 | 5190X | X6222 |
| 1E8 | 4 | 4 |
| 1E9 | 10 | 10 |
| 1EX | 26X | 6E |
| 1EE | 4172 | 8318 |
| 200 | 1694 | 431 |
Bases 201 to 300[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 201 | 150 | 72 |
| 202 | 82 | 82 |
| 203 | 17294 | 95E6 |
| 204 | 1E461 | 180X2 |
| 205 | 8 | 8 |
| 206 | 9E | 9E |
| 207 | 170646 | 280658 |
| 208 | X | X |
| 209 | 6541X | 63338 |
| 20X | 133 | 98 |
| 20E | 4 | 4 |
| 210 | 71 | 71 |
| 211 | 4326X6 | 477008 |
| 212 | 14 | 11 |
| 213 | 8515X | 414X0 |
| 214 | X1 | 2E6 |
| 215 | 14 | 14 |
| 216 | 189E69 | 1X8X7 |
| 217 | 2X | 8 |
| 218 | 88 | 88 |
| 219 | 7X | 7X |
| 21X | 10E3X0 | 1566X5 |
| 21E | EX | 12 |
| 220 | 36E611 | 84421 |
| 221 | 54500 | 4EE6 |
| 222 | 4 | 4 |
| 223 | E4X | 630 |
| 224 | 11X480 | 11X480 |
| 225 | 44 | 12 |
| 226 | 100 | 100 |
| 227 | 490 | X72 |
| 228 | 8X | 8X |
| 229 | 1X | 1X |
| 22X | 16 | 16 |
| 22E | 13X4 | 46408 |
| 230 | 12 | 12 |
| 231 | 23884X7X | 31979442 |
| 232 | 92 | 92 |
| 233 | 1098 | 4X0 |
| 234 | 40 | 40 |
| 235 | 4 | 4 |
| 236 | 56X3897 | 5650866 |
| 237 | 116376 | 1X8012 |
| 238 | 32 | 32 |
| 239 | 392X | 35X |
| 23X | 56 | 56 |
| 23E | 8 | 8 |
| 240 | 452X8 | 30576 |
| 241 | 386 | 276 |
| 242 | 94 | 62 |
| 243 | 14 | 14 |
| 244 | 219 | 28 |
| 245 | 18 | 18 |
| 246 | 3X0 | 445 |
| 247 | 1154 | E78 |
| 248 | 4 | 4 |
| 249 | 9E6132X8 | 301936068 |
| 24X | 754E41X | 86266E |
| 24E | 24 | 24 |
| 250 | 13423 | X854 |
| 251 | 6 | 6 |
| 252 | 12 | 12 |
| 253 | 56EX0 | 14050 |
| 254 | 475X | 14X2 |
| 255 | 14 | 4X |
| 256 | E9 | E9 |
| 257 | 11796 | 22892 |
| 258 | 8 | 8 |
| 259 | 1X0304 | 242012 |
| 25X | 92518E6 | 92E3XEE |
| 25E | 4 | 4 |
| 260 | 444 | 2232 |
| 261 | 687144 | 5172 |
| 262 | X | X |
| 263 | 54 | 54 |
| 264 | 203 | 62 |
| 265 | 214 | 52 |
| 266 | 39X27 | 1279 |
| 267 | 2006 | 438 |
| 268 | 34 | 34 |
| 269 | 30 | 30 |
| 26X | 114 | 383 |
| 26E | 28 | 28 |
| 270 | 5743 | 2711 |
| 271 | X0 | 62 |
| 272 | 4 | 4 |
| 273 | 2622084 | 344090 |
| 274 | 42X | 100 |
| 275 | 8 | 8 |
| 276 | 3890 | X65 |
| 277 | 186 | 48 |
| 278 | X8 | X8 |
| 279 | X87X | 81724 |
| 27X | 6797 | 7910 |
| 27E | 712 | 154 |
| 280 | 6 | 6 |
| 281 | 1132554 | 11X4296 |
| 282 | 71 | 38 |
| 283 | 105X | 82 |
| 284 | 44289 | 9XX3E |
| 285 | 4 | 4 |
| 286 | E5 | E5 |
| 287 | 9E71X | 739606 |
| 288 | XX | 62 |
| 289 | 29E00 | 66X6 |
| 28X | 113 | 113 |
| 28E | X | X |
| 290 | 3059 | 20148 |
| 291 | 612X | 83746 |
| 292 | 8 | 8 |
| 293 | 5X5904692 | 3759957E8 |
| 294 | 4225456 | 6884X66 |
| 295 | 58 | 58 |
| 296 | 78 | 78 |
| 297 | 6730 | 123X0 |
| 298 | 4 | 4 |
| 299 | 102 | 102 |
| 29X | 136 | 415 |
| 29E | 14 | 14 |
| 2X0 | 30E2 | 30E0 |
| 2X1 | X4 | 386 |
| 2X2 | E4 | E4 |
| 2X3 | 2291X | 2XX52 |
| 2X4 | E0 | 59 |
| 2X5 | 1X | 1X |
| 2X6 | 70 | 70 |
| 2X7 | 722518710 | 767432856 |
| 2X8 | E8 | E8 |
| 2X9 | 48 | 48 |
| 2XX | 4X3X | 6959 |
| 2XE | 4 | 4 |
| 2E0 | 92448E | 22395X1 |
| 2E1 | 2717X | 36748 |
| 2E2 | 3X | 3X |
| 2E3 | 5742 | X80 |
| 2E4 | 14 | 59 |
| 2E5 | 5X | 5X |
| 2E6 | 52 | 52 |
| 2E7 | 1E6304X | 844086 |
| 2E8 | X | X |
| 2E9 | 38 | 38 |
| 2EX | 10E79 | 22168 |
| 2EE | E7X2 | 8X98 |
| 300 | 23091 | 93558 |
Bases 301 to 400[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 301 | 246 | 78 |
| 302 | 4 | 4 |
| 303 | 872X564XX | 6197286E82 |
| 304 | 154 | 459 |
| 305 | 8 | 12 |
| 306 | 1635 | 132X |
| 307 | 2X | 100 |
| 308 | 8 | 8 |
| 309 | 9X | 9X |
| 30X | 19340 | 2733E |
| 30E | 134 | 24 |
| 310 | 12E | 12E |
| 311 | 880X | 210E6 |
| 312 | 104 | 62 |
| 313 | 150 | 104 |
| 314 | 68673 | 64170 |
| 315 | 4 | 4 |
| 316 | X2 | X2 |
| 317 | 48210 | 43X36 |
| 318 | 108 | 4E |
| 319 | 1766618 | 168790X |
| 31X | 6 | 6 |
| 31E | 18 | 18 |
| 320 | 4E76257 | 21679440 |
| 321 | 411EX | 300830 |
| 322 | 14 | 14 |
| 323 | 20 | 20 |
| 324 | 19X63 | 2866E |
| 325 | 8 | 8 |
| 326 | 2379X2X | E906E0 |
| 327 | 830 | 478 |
| 328 | 4 | 4 |
| 329 | 39208 | 2X0E6X |
| 32X | 3910 | 104E6 |
| 32E | 8 | 12 |
| 330 | 14X | 14X |
| 331 | 3X | 370 |
| 332 | 112 | 112 |
| 333 | 2782 | 526 |
| 334 | 73 | 73 |
| 335 | 8 | 12 |
| 336 | 33 | 33 |
| 337 | 200 | 42 |
| 338 | 44 | 44 |
| 339 | 39288 | 81E2 |
| 33X | 212851 | 15X338 |
| 33E | 4 | 4 |
| 340 | 32 | 32 |
| 341 | 3XE36E0 | 88390E2 |
| 342 | 8 | 8 |
| 343 | 28 | 15E4 |
| 344 | 80 | 80 |
| 345 | 1E28 | 4034 |
| 346 | 126899 | 61682E |
| 347 | 3E04 | 1380 |
| 348 | 118 | 118 |
| 349 | 6 | 6 |
| 34X | 8903 | 23983 |
| 34E | 34 | 34 |
| 350 | 72 | 72 |
| 351 | 230 | 122 |
| 352 | 4 | 4 |
| 353 | 29487X | 57966 |
| 354 | E9 | 452 |
| 355 | 14 | 6X |
| 356 | 4753 | 47896 |
| 357 | 1290 | 1442 |
| 358 | 11X | 11X |
| 359 | 1E2 | 5EX |
| 35X | 5140 | 4168 |
| 35E | 8 | 8 |
| 360 | 149 | 149 |
| 361 | 154 | 4E6 |
| 362 | 21 | 12 |
| 363 | 7E2 | 6X04 |
| 364 | 24EX60 | 4E1375 |
| 365 | 4 | 4 |
| 366 | 162 | 162 |
| 367 | 527388194190 | 46X9221724176 |
| 368 | 16 | 12 |
| 369 | 22630 | X8376 |
| 36X | 2X3 | 88 |
| 36E | 38 | 38 |
| 370 | EX | EX |
| 371 | 30 | 30 |
| 372 | 124 | 124 |
| 373 | 12 | 12 |
| 374 | 6EX | 7X0 |
| 375 | 24 | 24 |
| 376 | 16X84 | 5805 |
| 377 | 6360 | E0 |
| 378 | 4 | 4 |
| 379 | 2X87X86 | 2974478 |
| 37X | 271 | 630 |
| 37E | X | X |
| 380 | 98 | 3E |
| 381 | 690 | 46 |
| 382 | 4X | 4X |
| 383 | 18 | 18 |
| 384 | 34 | 3E9 |
| 385 | 74 | 74 |
| 386 | 8X | 8X |
| 387 | 1684X00 | 300070 |
| 388 | 12X | 12X |
| 389 | 8633X | 55X24 |
| 38X | 23 | 8 |
| 38E | 4 | 4 |
| 390 | 447963 | 327062 |
| 391 | 5137500 | 5258962 |
| 392 | 28 | 132 |
| 393 | 38EX | 1544 |
| 394 | 54 | 163 |
| 395 | 8 | 8 |
| 396 | 1313X854 | 3E1984X |
| 397 | 67EX56 | 630X78 |
| 398 | 14 | 11 |
| 399 | 2X | 2X |
| 39X | 97 | 476 |
| 39E | 1X | 1X |
| 3X0 | 66 | 66 |
| 3X1 | 1156 | 16526 |
| 3X2 | 4 | 4 |
| 3X3 | 168E0 | 29822 |
| 3X4 | 115896X | 8869843 |
| 3X5 | 14 | 28 |
| 3X6 | 197 | 197 |
| 3X7 | 6 | 6 |
| 3X8 | X | X |
| 3X9 | 21341X2 | 2002034 |
| 3XX | 10 | 13E |
| 3XE | 10 | 3X |
| 3E0 | 96 | 96 |
| 3E1 | 4XX0 | EE06 |
| 3E2 | 8 | 8 |
| 3E3 | 650 | 1336 |
| 3E4 | 11600 | E243 |
| 3E5 | 4 | 4 |
| 3E6 | EE3E34 | 4234326 |
| 3E7 | 10 | 10 |
| 3E8 | 13X | 13X |
| 3E9 | 150 | 150 |
| 3EX | 20 | 20 |
| 3EE | 6705X | 38XX8 |
| 400 | 158X3 | X372 |
Bases 401 to 500[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 401 | 474 | 16 |
| 402 | 58 | EX |
| 403 | 72 | 150 |
| 404 | 2X6 | 11E |
| 405 | 82 | 82 |
| 406 | 46 | 46 |
| 407 | 1896 | 1792 |
| 408 | 4 | 4 |
| 409 | 47E9088 | 4943136 |
| 40X | 7154E06 | 1E8X486 |
| 40E | 8 | 8 |
| 410 | 7X | 7X |
| 411 | 2X6 | 6E8 |
| 412 | 144 | 144 |
| 413 | 9496 | 15X04 |
| 414 | 11889 | 9E50 |
| 415 | X | X |
| 416 | 6 | 6 |
| 417 | 126320 | 120E02 |
| 418 | 148 | 148 |
| 419 | 10 | 98 |
| 41X | X8E4 | 21380 |
| 41E | 4 | 4 |
| 420 | 77E6X4 | 4E584 |
| 421 | 160 | 582 |
| 422 | 58 | 58 |
| 423 | 1178 | 6678 |
| 424 | 19 | 19 |
| 425 | 84 | 84 |
| 426 | 251X4 | 37258 |
| 427 | 1830XX | 25X28 |
| 428 | 8 | 8 |
| 429 | 134 | 134 |
| 42X | EX | 529 |
| 42E | 14 | 9X |
| 430 | 7X012 | 51025 |
| 431 | X80 | 180E0 |
| 432 | 4 | 4 |
| 433 | 2X | 2X |
| 434 | 26859 | 1169E |
| 435 | 36X | 88 |
| 436 | 238E | 1559 |
| 437 | 7X | 160 |
| 438 | 1X | 1X |
| 439 | E408 | 923XX |
| 43X | 76 | 76 |
| 43E | 12 | 12 |
| 440 | 2X4683 | 23590E |
| 441 | X104 | 13398 |
| 442 | X | X |
| 443 | 7196 | 62912 |
| 444 | 754 | 136 |
| 445 | 4 | 4 |
| 446 | 8062097 | 8213908 |
| 447 | 29164X0 | 42202698 |
| 448 | 8 | 12 |
| 449 | 359X | 6E8 |
| 44X | X6 | X6 |
| 44E | 44 | 44 |
| 450 | 23 | 23 |
| 451 | 100 | 100 |
| 452 | 5X | 5X |
| 453 | E68 | 12X0 |
| 454 | 6X99 | 5EX5 |
| 455 | 8X | 20X |
| 456 | 63E0 | 1X3X |
| 457 | 1X | 210 |
| 458 | 4 | 4 |
| 459 | 16 | 16 |
| 45X | 265E9 | 15722 |
| 45E | X4 | 494 |
| 460 | 208 | 179 |
| 461 | 100 | 12 |
| 462 | 8 | 8 |
| 463 | 1630112 | 17E5420 |
| 464 | X02061 | 24E7E3 |
| 465 | 92 | 92 |
| 466 | 199 | 199 |
| 467 | 4016 | 1XX6 |
| 468 | 101 | 62 |
| 469 | 40 | 1X |
| 46X | E9X4 | 10E73 |
| 46E | 4 | 4 |
| 470 | 36X13 | 136807 |
| 471 | 1717EE7E7844 | 3481XE184272 |
| 472 | 12 | 12 |
| 473 | 598X | 878 |
| 474 | 6 | 6 |
| 475 | 32 | 32 |
| 476 | 173 | 62X |
| 477 | 1320X | 596 |
| 478 | 8 | 12 |
| 479 | 56 | 56 |
| 47X | 183 | 183 |
| 47E | 8 | 8 |
| 480 | 1E46 | 1EE94 |
| 481 | 29179X | 660382 |
| 482 | 4 | 4 |
| 483 | 122044 | 19X74 |
| 484 | 589 | 105 |
| 485 | 94 | 94 |
| 486 | 143 | 143 |
| 487 | 14 | 136 |
| 488 | 16X | 16X |
| 489 | 28 | 28 |
| 48X | 3E53 | 1E86E |
| 48E | 18 | 18 |
| 490 | 72 | 3X |
| 491 | 268E30 | 210288 |
| 492 | 172 | 172 |
| 493 | 4730 | 2866 |
| 494 | 89 | 89 |
| 495 | 4 | 4 |
| 496 | E0677379 | 12100680 |
| 497 | 31E8280 | 1538222 |
| 498 | 8 | 8 |
| 499 | 3994 | 8776 |
| 49X | 787 | 1E3 |
| 49E | 24 | 24 |
| 4X0 | 200 | 200 |
| 4X1 | 8344 | 2760 |
| 4X2 | 174 | 174 |
| 4X3 | 6 | 6 |
| 4X4 | 10458601 | 97053979 |
| 4X5 | 78 | 12 |
| 4X6 | 63 | 63 |
| 4X7 | 38X | 26E2 |
| 4X8 | 4 | 4 |
| 4X9 | 349E550 | 769042 |
| 4XX | 299 | 212 |
| 4XE | 4X | 12 |
| 4E0 | 144E5 | 1E969 |
| 4E1 | 15X | 650 |
| 4E2 | 68 | 68 |
| 4E3 | 24830 | 2764 |
| 4E4 | 380 | 135 |
| 4E5 | 8 | 8 |
| 4E6 | 10 | 10 |
| 4E7 | 725299X | 331E782 |
| 4E8 | 17X | 17X |
| 4E9 | 87E92 | 157XX |
| 4EX | 183 | 713 |
| 4EE | 4 | 4 |
| 500 | 88 | 88 |
Bases 501 to 600[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 501 | 11X2564 | 13E3366 |
| 502 | 8 | 182 |
| 503 | 1442 | 7530 |
| 504 | 150 | 4E |
| 505 | X | X |
| 506 | 37X9348 | 432E477 |
| 507 | 54 | 186 |
| 508 | 3X009X | X312X |
| 509 | 62 | 62 |
| 50X | 123 | 123 |
| 50E | 52 | 52 |
| 510 | 3E104 | X2710 |
| 511 | 834X | 2406 |
| 512 | 4 | 4 |
| 513 | 8518X | 1226782 |
| 514 | E1 | 606 |
| 515 | 34 | 34 |
| 516 | 747E | 7E4X |
| 517 | 30 | 30 |
| 518 | 12 | 12 |
| 519 | 114 | 114 |
| 51X | 15766 | 10576 |
| 51E | 28 | 28 |
| 520 | 20E | 20E |
| 521 | 141914 | 16422 |
| 522 | 6X | 2X |
| 523 | 28 | X0 |
| 524 | 8X | 5E3 |
| 525 | 4 | 4 |
| 526 | X1E8E | 139E5 |
| 527 | 1E8E4 | 41702 |
| 528 | 14 | 85 |
| 529 | 100 | 100 |
| 52X | 211 | 740 |
| 52E | 8 | 8 |
| 530 | 1X875139 | 16353E22 |
| 531 | 23500 | 14016 |
| 532 | X | X |
| 533 | 48 | 48 |
| 534 | 32192129 | 7716X19 |
| 535 | X8 | X8 |
| 536 | 186 | 8 |
| 537 | 7379X | 387902 |
| 538 | 4 | 4 |
| 539 | XX2448 | 85E83X |
| 53X | 177 | 6E6 |
| 53E | 68 | 124 |
| 540 | 2805E | 2805E |
| 541 | 6 | 6 |
| 542 | 194 | 194 |
| 543 | 108XX2 | 40702 |
| 544 | 11507 | 137X6 |
| 545 | 38 | 38 |
| 546 | 51 | 51 |
| 547 | 357250 | 83900 |
| 548 | 8 | 8 |
| 549 | 8098362 | 7X46XE4 |
| 54X | 154 | 4X0 |
| 54E | 4 | 4 |
| 550 | 183 | 1E9 |
| 551 | 380 | 192 |
| 552 | 24 | 24 |
| 553 | 30 | 212 |
| 554 | 110 | 110 |
| 555 | XX | XX |
| 556 | X16XX | 19649 |
| 557 | 4544 | 13998 |
| 558 | 34 | 12 |
| 559 | 178 | 178 |
| 55X | 169 | 169 |
| 55E | X | X |
| 560 | 265 | 806 |
| 561 | 1608040 | 7457X0 |
| 562 | 4 | 4 |
| 563 | 3972 | 340X |
| 564 | 39XXEE37 | 9138358 |
| 565 | 8 | 8 |
| 566 | 137 | 243 |
| 567 | 26145E3X3394 | 265583948940 |
| 568 | 74 | 74 |
| 569 | 130E7248 | 1163483X |
| 56X | X9 | 2X0 |
| 56E | 14 | 58 |
| 570 | 6 | 6 |
| 571 | 4E6 | 78 |
| 572 | 1X4 | 1X4 |
| 573 | 26E04 | 16EE4 |
| 574 | 12067 | 2X216 |
| 575 | 4 | 4 |
| 576 | 15448 | 18797 |
| 577 | 3X0 | 198 |
| 578 | 14 | 11 |
| 579 | 136 | 136 |
| 57X | 463 | 118 |
| 57E | 14 | 14 |
| 580 | 247 | 247 |
| 581 | 836126 | 20X59E2 |
| 582 | 8 | 8 |
| 583 | X4 | X4 |
| 584 | 156E6 | 16X1X3 |
| 585 | E4 | 67X |
| 586 | 114E91 | 765X9 |
| 587 | 537X | 4946 |
| 588 | 4 | 4 |
| 589 | 128 | 128 |
| 58X | 39X7955163 | 21578542715 |
| 58E | 8 | 12 |
| 590 | 10 | 100 |
| 591 | 70 | 70 |
| 592 | 1E2 | 1E2 |
| 593 | 41844X | 6XEEE8 |
| 594 | 59 | 42 |
| 595 | E8 | E8 |
| 596 | 11X | 11X |
| 597 | 336 | 48 |
| 598 | 28 | 28 |
| 599 | 720 | 1266 |
| 59X | 599664 | 88480 |
| 59E | 4 | 4 |
| 5X0 | 5304 | 40E68 |
| 5X1 | 10XE4 | 11E36 |
| 5X2 | 58 | 1E4 |
| 5X3 | 1459X | 5010 |
| 5X4 | 43 | 12 |
| 5X5 | 3X | 3X |
| 5X6 | 37 | 2X |
| 5X7 | 73246 | 555926 |
| 5X8 | 1E8 | 1E8 |
| 5X9 | 14 | 14 |
| 5XX | 269 | 269 |
| 5XE | 5X | 5X |
| 5E0 | 182X6 | 4E29 |
| 5E1 | 150 | 52 |
| 5E2 | 4 | 4 |
| 5E3 | X858785X4634 | 9EX0426151X0 |
| 5E4 | 1XX01 | 5292E |
| 5E5 | X | X |
| 5E6 | 1846X | 11E05 |
| 5E7 | 336 | 38 |
| 5E8 | 8 | 8 |
| 5E9 | 3326E4 | 137028 |
| 5EX | 3XE1 | 13355 |
| 5EE | 8 | 12 |
| 600 | 126 | 126 |
Bases 601 to 700[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 601 | 5216XE6 | 7103038 |
| 602 | 14 | 2E |
| 603 | 78 | 78 |
| 604 | 66 | 66 |
| 605 | 4 | 4 |
| 606 | 56 | 56 |
| 607 | 10664 | 9638 |
| 608 | 82 | 82 |
| 609 | 154 | 154 |
| 60X | 6 | 6 |
| 60E | 62 | 62 |
| 610 | 725183E4 | 15406700 |
| 611 | 131X | 25392 |
| 612 | 1E | 204 |
| 613 | 2X | 2X |
| 614 | 1276X | 24240 |
| 615 | 8 | 8 |
| 616 | 3095 | 1299X |
| 617 | 230 | 230 |
| 618 | 4 | 4 |
| 619 | 244862 | 422870 |
| 61X | 28X0126 | 709469 |
| 61E | 32 | 32 |
| 620 | 11 | 59 |
| 621 | 440 | 1X2 |
| 622 | X | X |
| 623 | 22XE6EX0 | 22793692 |
| 624 | 137 | 139 |
| 625 | 28 | 104 |
| 626 | 25E | 1E8 |
| 627 | 39EE74 | 744E2 |
| 628 | 1X | 12 |
| 629 | 4502 | E210 |
| 62X | 26 | 26 |
| 62E | 4 | 4 |
| 630 | 10 | 44 |
| 631 | 10 | 10 |
| 632 | 8 | 8 |
| 633 | 242 | 123X2 |
| 634 | 261 | 896 |
| 635 | 9X | 108 |
| 636 | 46024203 | 49727X99 |
| 637 | 5515E4 | 1433E62 |
| 638 | 84 | 25 |
| 639 | 6 | 6 |
| 63X | 686XE4314801 | 68X0E0208119 |
| 63E | 154 | 18 |
| 640 | 237 | 237 |
| 641 | X26214 | 5600E6 |
| 642 | 4 | 4 |
| 643 | 1519378 | 13E599X |
| 644 | E0 | E0 |
| 645 | 14 | 14 |
| 646 | 12438 | 6XE6 |
| 647 | 20 | 20 |
| 648 | 87 | 87 |
| 649 | 2078936982 | 209865XE5X |
| 64X | 1E9 | 23 |
| 64E | 8 | 8 |
| 650 | 30 | 30 |
| 651 | 1799174X | 12EX1880 |
| 652 | 151 | 88 |
| 653 | 14694 | 34X6 |
| 654 | 14167 | 16996 |
| 655 | 4 | 4 |
| 656 | 18 | 18 |
| 657 | 19E8X | 2360 |
| 658 | 21X | 21X |
| 659 | 1152904 | 1697E4 |
| 65X | 14 | 19 |
| 65E | 12 | 12 |
| 660 | 4X030 | 4X030 |
| 661 | 14X | 7E0 |
| 662 | 222 | 20E |
| 663 | 3X | 3X |
| 664 | 3271 | 19455 |
| 665 | 112 | 112 |
| 666 | 152 | 152 |
| 667 | 9070 | XX86 |
| 668 | 4 | 4 |
| 669 | 282 | 282 |
| 66X | 2075167XE844 | 5020E7973 |
| 66E | 68 | 68 |
| 670 | 32 | 164 |
| 671 | 186 | 48 |
| 672 | 224 | 224 |
| 673 | 42 | 42 |
| 674 | 3227 | 316E |
| 675 | 44 | 1X2 |
| 676 | 279 | 279 |
| 677 | 3E391X | 543XE0 |
| 678 | X | X |
| 679 | E446 | 9EX |
| 67X | 2X4 | 126 |
| 67E | 4 | 4 |
| 680 | 3244115010X | EE55155494 |
| 681 | 6E4 | 32 |
| 682 | 8X | 8X |
| 683 | 796658X | 7599980 |
| 684 | 543 | 142 |
| 685 | 8 | 8 |
| 686 | 219633792 | 1762535X6 |
| 687 | 100 | 2X0 |
| 688 | 14 | 14 |
| 689 | 80 | 80 |
| 68X | 188E20 | 197066 |
| 68E | 8738 | 20X2 |
| 690 | 1E3 | 1E3 |
| 691 | 5430 | 10822 |
| 692 | 4 | 4 |
| 693 | 161284 | 117268 |
| 694 | 1607819 | 753EE |
| 695 | 114 | 118 |
| 696 | 129 | 129 |
| 697 | 6 | 6 |
| 698 | 92 | 92 |
| 699 | 989E51064X | 19922075776 |
| 69X | 1XE34 | 2X16 |
| 69E | 34 | 12 |
| 6X0 | 144 | 144 |
| 6X1 | 630 | 72 |
| 6X2 | 8 | 8 |
| 6X3 | 122 | 122 |
| 6X4 | E7X | 210 |
| 6X5 | 4 | 4 |
| 6X6 | 345215 | 692E37 |
| 6X7 | 3066 | 66X6 |
| 6X8 | 238 | 124 |
| 6X9 | 30 | 8 |
| 6XX | 293 | 293 |
| 6XE | 6X | 6X |
| 6E0 | 3469 | 266E4 |
| 6E1 | 18X40 | 4X906 |
| 6E2 | 32 | 32 |
| 6E3 | 1X56 | 19EX |
| 6E4 | 10 | 10 |
| 6E5 | 11X | 814 |
| 6E6 | 874 | 179 |
| 6E7 | 2914 | 290 |
| 6E8 | 4 | 4 |
| 6E9 | 2772X | E9914 |
| 6EX | 383 | X82 |
| 6EE | 8 | 8 |
| 700 | 431E276 | 260X37 |
Bases 701 to 800[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 701 | 214 | 916 |
| 702 | 242 | 242 |
| 703 | 154 | 154 |
| 704 | 9467 | 397653 |
| 705 | 12 | 12 |
| 706 | 6 | 6 |
| 707 | 406661X | 384X398 |
| 708 | 94 | 94 |
| 709 | X46 | 630 |
| 70X | 38997 | 54498 |
| 70E | 4 | 4 |
| 710 | 2806E969 | 27849868 |
| 711 | 1386 | 162 |
| 712 | 8 | X |
| 713 | 266012 | 336E6 |
| 714 | 69 | 69 |
| 715 | 18 | 18 |
| 716 | 111 | 111 |
| 717 | 40E20 | 10418 |
| 718 | 8 | 8 |
| 719 | 88 | 88 |
| 71X | 37729 | 27756 |
| 71E | 212 | 38 |
| 720 | 2X63 | 2X63 |
| 721 | EX | 136 |
| 722 | 4 | 4 |
| 723 | 30 | 30 |
| 724 | 2E6 | X1E |
| 725 | 124 | 124 |
| 726 | 967 | E23E |
| 727 | 100 | 12 |
| 728 | 24X | 24X |
| 729 | 15068850 | 1193E864 |
| 72X | 30 | 368 |
| 72E | 24 | 24 |
| 730 | 19 | 19 |
| 731 | 22E666 | 740X8 |
| 732 | 252 | 252 |
| 733 | 2X058 | 581X4 |
| 734 | 60X3 | 7079 |
| 735 | 4 | 4 |
| 736 | 102E4X | 57X84 |
| 737 | 728183X | 247124X8 |
| 738 | 12 | 12 |
| 739 | 10X | 10X |
| 73X | 2E1 | X30 |
| 73E | X | X |
| 740 | 423 | 31X |
| 741 | 1416 | 1702 |
| 742 | 8 | 11 |
| 743 | 46 | 46 |
| 744 | 1639196 | 1639196 |
| 745 | 4X | 4X |
| 746 | 7238X | 41616 |
| 747 | 186 | 18 |
| 748 | 4 | 4 |
| 749 | 34 | 34 |
| 74X | 811 | 82 |
| 74E | 14 | 74 |
| 750 | 23X0X | 391E0 |
| 751 | 8X | 820 |
| 752 | 8 | 8 |
| 753 | E622 | X86 |
| 754 | 579 | 1112 |
| 755 | 12X | 12X |
| 756 | 38 | 38 |
| 757 | 2E6 | E36 |
| 758 | 87 | 87 |
| 759 | 2X | 2X |
| 75X | 593 | 188 |
| 75E | 4 | 4 |
| 760 | 79 | 79 |
| 761 | 4407500 | 3E04256 |
| 762 | 18 | 18 |
| 763 | 55X6 | 18666 |
| 764 | 6 | 6 |
| 765 | 132 | 132 |
| 766 | 111554 | 2411E2 |
| 767 | 2E6 | 380 |
| 768 | X | X |
| 769 | 232 | 232 |
| 76X | 18467 | 12X06 |
| 76E | 8 | 8 |
| 770 | E475 | 2645 |
| 771 | 1116X07X | 10892858 |
| 772 | 4 | 4 |
| 773 | 9904 | 11496 |
| 774 | 430E9183 | 18E48348 |
| 775 | 52 | 12 |
| 776 | 179 | 1EX |
| 777 | 2X | 100 |
| 778 | 268 | 268 |
| 779 | 32 | X04 |
| 77X | 6713 | 19853 |
| 77E | 1X | 1X |
| 780 | 12 | 12 |
| 781 | 66 | 66 |
| 782 | 34 | 6E |
| 783 | 2334996 | 1X43788 |
| 784 | 63XX | 101E |
| 785 | 4 | 4 |
| 786 | 84 | 84 |
| 787 | 2774 | 10768 |
| 788 | 8 | 8 |
| 789 | 8086 | E74 |
| 78X | 623 | 168 |
| 78E | 28 | 28 |
| 790 | 39X8XE | 3EX01 |
| 791 | 210 | 210 |
| 792 | 14 | 85 |
| 793 | 6 | 6 |
| 794 | 4X | 823 |
| 795 | X | X |
| 796 | 4652 | 10872 |
| 797 | 310X | 10242 |
| 798 | 4 | 4 |
| 799 | 30501314 | 30501314 |
| 79X | 1X | 3E |
| 79E | 3X | 24 |
| 7X0 | 5E3E0 | 16227E |
| 7X1 | 96 | 96 |
| 7X2 | 12 | 12 |
| 7X3 | 49309EX | E171352 |
| 7X4 | 370 | 370 |
| 7X5 | 8 | 8 |
| 7X6 | 16X | 16X |
| 7X7 | 1024676 | 2330X18 |
| 7X8 | 6E | 278 |
| 7X9 | 1E95X2 | 44275X |
| 7XX | E3 | E3 |
| 7XE | 4 | 4 |
| 7E0 | 116 | 116 |
| 7E1 | 3081X | 3389X8 |
| 7E2 | X8 | X8 |
| 7E3 | 10 | 10 |
| 7E4 | 323 | 323 |
| 7E5 | 13X | 13X |
| 7E6 | 26E | X66 |
| 7E7 | 150 | 150 |
| 7E8 | 15 | 4E |
| 7E9 | 20 | 20 |
| 7EX | 16E19778E1 | 3959E516515 |
| 7EE | 1E46X | 48E82 |
| 800 | 2082 | 2082 |
Bases 801 to 900[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 801 | 2E426 | 16292 |
| 802 | 4 | 4 |
| 803 | 168XX | 33636X |
| 804 | 1E59 | 76 |
| 805 | 28 | 142 |
| 806 | 39X | 39X |
| 807 | 150 | 72 |
| 808 | 38 | 38 |
| 809 | 524 | 2X6 |
| 80X | 18237 | 1E680 |
| 80E | 82 | 82 |
| 810 | 176 | 176 |
| 811 | 46 | 46 |
| 812 | 10 | 100 |
| 813 | 1X9X | 1X9X |
| 814 | 596 | 23E |
| 815 | 4 | 4 |
| 816 | 2X497X04 | 5172E277 |
| 817 | 57494340 | 5X659E28 |
| 818 | 14 | 14 |
| 819 | 185X | 652 |
| 81X | 3X | 139 |
| 81E | 8 | 8 |
| 820 | 228 | 228 |
| 821 | 7X | 7E8 |
| 822 | 3E | 12 |
| 823 | 128 | 128 |
| 824 | 361903 | 204623 |
| 825 | 144 | 96X |
| 826 | 23 | 23 |
| 827 | 1E12X | 10080 |
| 828 | 4 | 4 |
| 829 | 260138 | 14X5X0 |
| 82X | 56770 | 1463X6 |
| 82E | X | X |
| 830 | 49 | 100 |
| 831 | 6 | 6 |
| 832 | 292 | 292 |
| 833 | 24036 | 97142 |
| 834 | 50357 | 6876 |
| 835 | 148 | 148 |
| 836 | 33E | 33E |
| 837 | 4E6 | 98 |
| 838 | 8 | 8 |
| 839 | 103E1E2 | 1320X8X |
| 83X | 163 | 163 |
| 83E | 4 | 4 |
| 840 | 728548 | 782587 |
| 841 | 7757X | E7576 |
| 842 | 158 | 294 |
| 843 | E0 | 160 |
| 844 | 341 | E86 |
| 845 | 58 | 58 |
| 846 | 258 | XX3 |
| 847 | 6604X | 16E68 |
| 848 | 12 | 12 |
| 849 | 2X | 2X |
| 84X | 126 | 126 |
| 84E | 84 | 914 |
| 850 | 138163 | 2069X |
| 851 | 128940X | 933X86 |
| 852 | 4 | 4 |
| 853 | 2E48X | 1266X6 |
| 854 | 18E78050 | 46E6030 |
| 855 | 8 | 8 |
| 856 | 114 | 114 |
| 857 | 134 | 2E6 |
| 858 | X | X |
| 859 | EX | EX |
| 85X | 544X4 | 1598XE |
| 85E | 14 | 14 |
| 860 | 6 | 6 |
| 861 | X3X2X | 303X0 |
| 862 | 2X2 | 2X2 |
| 863 | 302X | 5X44 |
| 864 | 2E0E9 | 599 |
| 865 | 4 | 4 |
| 866 | 93171 | 8671 |
| 867 | X0 | X0 |
| 868 | E4 | 54 |
| 869 | 163714 | 25778 |
| 86X | 33 | 12 |
| 86E | 88 | 88 |
| 870 | 76X90274 | 8X22E245 |
| 871 | 6110 | 134X2 |
| 872 | 8 | 8 |
| 873 | 7X | 7X |
| 874 | 164 | X19 |
| 875 | 1X | 1X |
| 876 | 244 | 1E |
| 877 | 2410 | 9E8 |
| 878 | 4 | 4 |
| 879 | 76 | 76 |
| 87X | 9X4 | 125 |
| 87E | 12 | 12 |
| 880 | XE671 | 12557 |
| 881 | 397864 | 6XX16 |
| 882 | E8 | E8 |
| 883 | EX16 | 108492 |
| 884 | 30 | 212 |
| 885 | 8 | X |
| 886 | 75 | 359 |
| 887 | 2E243E800 | 9349450E8 |
| 888 | 2XX | 2XX |
| 889 | 136 | 136 |
| 88X | 109894 | 6X3E6 |
| 88E | 4 | 4 |
| 890 | 285 | 285 |
| 891 | 39282604 | 38836362 |
| 892 | 14 | 61 |
| 893 | 2145X | E698 |
| 894 | 19 | 19 |
| 895 | 158 | 114 |
| 896 | 263 | 263 |
| 897 | 3060X | 25652 |
| 898 | 3X | 3X |
| 899 | X6 | X6 |
| 89X | 187 | X66 |
| 89E | 44 | 44 |
| 8X0 | 1X3 | 1X3 |
| 8X1 | 54 | 186 |
| 8X2 | 4 | 4 |
| 8X3 | 100 | 352 |
| 8X4 | 176X0 | 11275E |
| 8X5 | 5X | 5X |
| 8X6 | 4EE52 | 256656 |
| 8X7 | 490 | 230 |
| 8X8 | 8 | 8 |
| 8X9 | 9601X04 | 9XE948 |
| 8XX | 1E024 | 212E3 |
| 8XE | 8X | 1X |
| 8E0 | 23 | 194 |
| 8E1 | 8686 | 386872 |
| 8E2 | X | X |
| 8E3 | 1X | 1X |
| 8E4 | 25X09 | 3890 |
| 8E5 | 4 | 4 |
| 8E6 | 339404 | 70889 |
| 8E7 | 16 | 16 |
| 8E8 | 3E | 12 |
| 8E9 | XX38 | 18714 |
| 8EX | 6 | 6 |
| 8EE | 182 | 408 |
| 900 | 1330 | 9X4 |
Bases 901 to X00[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 901 | 6E6 | 208 |
| 902 | 302 | 302 |
| 903 | 12 | 12 |
| 904 | 410919 | XE5390 |
| 905 | 8 | 8 |
| 906 | 49383 | 33265 |
| 907 | 9640 | 22X72 |
| 908 | 4 | 4 |
| 909 | 2E188 | 155E2 |
| 90X | 100641X | 3687632 |
| 90E | 92 | 92 |
| 910 | 2X | 16 |
| 911 | 28X | EX0 |
| 912 | 1X | 18 |
| 913 | 3471X | X9E9E0 |
| 914 | 573 | 362 |
| 915 | 14 | 62 |
| 916 | 1X0 | 1X0 |
| 917 | 40 | 40 |
| 918 | 308 | 308 |
| 919 | E9X4 | 18268 |
| 91X | 1XX97 | 2632 |
| 91E | 4 | 4 |
| 920 | 702E260E | 9305731 |
| 921 | 70656 | E8478 |
| 922 | 8 | 8 |
| 923 | 30254 | 1054X |
| 924 | 46 | 46 |
| 925 | 12 | 12 |
| 926 | 55338 | 113E94 |
| 927 | 24X50 | 11380 |
| 928 | 30X | 267 |
| 929 | 6 | 6 |
| 92X | 1859983 | 2371588 |
| 92E | 32 | 32 |
| 930 | 160 | 160 |
| 931 | 304 | 1036 |
| 932 | 4 | 4 |
| 933 | 1027262X | 1566676 |
| 934 | 13X | X73 |
| 935 | 168 | 168 |
| 936 | 153 | 153 |
| 937 | 56 | 56 |
| 938 | 104 | 104 |
| 939 | 2E8 | 2E8 |
| 93X | 59 | 1076 |
| 93E | 8 | 8 |
| 940 | 38E | 38E |
| 941 | 2EE539298E46 | 1476884EE0 |
| 942 | 314 | 175 |
| 943 | 2E14 | E84 |
| 944 | 550 | 3E5 |
| 945 | 4 | 4 |
| 946 | 404 | 404 |
| 947 | 3513520 | 4053822 |
| 948 | X | X |
| 949 | X73E6 | 1EX94 |
| 94X | 391 | 1120 |
| 94E | 94 | 94 |
| 950 | 382 | 177 |
| 951 | 186 | 270 |
| 952 | 108 | 108 |
| 953 | 14 | 14 |
| 954 | E6990 | 36E55 |
| 955 | 114 | 7X |
| 956 | 125 | 276 |
| 957 | EX | 28 |
| 958 | 4 | 4 |
| 959 | 4141242X | 1266E46X |
| 95X | 1377144234 | 2E16161128 |
| 95E | 18 | 18 |
| 960 | X66 | 8073 |
| 961 | E4 | 30 |
| 962 | 254 | 38 |
| 963 | 33000X0 | 3538E8 |
| 964 | 1X6X666 | 1126E960E |
| 965 | 14 | 12 |
| 966 | 19 | 19 |
| 967 | 9X66 | 5EE6 |
| 968 | 14 | 2E |
| 969 | 408 | 408 |
| 96X | 289 | 289 |
| 96E | 4 | 4 |
| 970 | 21XX74 | 26X9X7 |
| 971 | 37279X | 39376 |
| 972 | 224 | 2XX |
| 973 | 2128 | 2854 |
| 974 | 1E0 | 1E0 |
| 975 | 8 | 8 |
| 976 | 368 | 368 |
| 977 | 110545X | 28X8136 |
| 978 | 328 | 272 |
| 979 | 2X8 | 2X8 |
| 97X | 386 | 386 |
| 97E | 24 | 24 |
| 980 | 275 | 2E6 |
| 981 | 200 | 200 |
| 982 | 4 | 4 |
| 983 | 468 | 766 |
| 984 | 363 | 363 |
| 985 | 174 | 174 |
| 986 | 277E | 32X5 |
| 987 | 6 | 6 |
| 988 | 32X | 223 |
| 989 | 1685302 | 1685302 |
| 98X | 267 | 1036 |
| 98E | 12 | 12 |
| 990 | 28X | 3X9 |
| 991 | 444 | 1216 |
| 992 | 8 | 8 |
| 993 | 82 | 352 |
| 994 | 51E77 | 37270 |
| 995 | 4 | 4 |
| 996 | 70 | 70 |
| 997 | 102X48E4 | 7E91326 |
| 998 | 8 | 12 |
| 999 | 212 | 212 |
| 99X | 7X3 | 1E8 |
| 99E | 4X | 4X |
| 9X0 | 40 | 1013 |
| 9X1 | 27194X | 1017X6 |
| 9X2 | X | X |
| 9X3 | 15X | 15X |
| 9X4 | 49 | 49 |
| 9X5 | 68 | 68 |
| 9X6 | 194E3 | 9X71 |
| 9X7 | 293010 | 1E6498 |
| 9X8 | 4 | 4 |
| 9X9 | 380 | 380 |
| 9XX | 121360 | 4166E |
| 9XE | 8 | 8 |
| 9E0 | 729EX | 114523 |
| 9E1 | 10 | 10 |
| 9E2 | 44 | 44 |
| 9E3 | 1579E42 | 633224 |
| 9E4 | 260 | 829 |
| 9E5 | 10 | 3X |
| 9E6 | 6 | 6 |
| 9E7 | 24697E54 | 9709578 |
| 9E8 | 33X | 33X |
| 9E9 | 13490 | 9498 |
| 9EX | 15016 | 171X0 |
| 9EE | 4 | 4 |
| X00 | 19E | 19E |
Bases X01 to E00[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| X01 | 936 | 88 |
| X02 | 12 | 12 |
| X03 | 12562 | 146558 |
| X04 | 14 | 59 |
| X05 | 182 | 182 |
| X06 | 67000 | 3503E2 |
| X07 | 16X936 | 886652 |
| X08 | 8 | 8 |
| X09 | 72 | 72 |
| X0X | 196X6536 | 2EE203140 |
| X0E | X | X |
| X10 | 16919 | 696XX |
| X11 | 18556 | 20998 |
| X12 | 4 | 4 |
| X13 | 54 | 54 |
| X14 | 137 | E50 |
| X15 | 62678 | 32X9E8 |
| X16 | 797 | 797 |
| X17 | 570 | 62 |
| X18 | 348 | 348 |
| X19 | 3X8 | 3X8 |
| X1X | 2X | 18 |
| X1E | 52 | 52 |
| X20 | 206 | 206 |
| X21 | 132E56 | 2E7128 |
| X22 | 231 | 118 |
| X23 | 4050 | 885X |
| X24 | 560 | 485 |
| X25 | 4 | 4 |
| X26 | 58X1E15 | 12943X93 |
| X27 | 13E7706 | 3XE2962 |
| X28 | 32E | 34X |
| X29 | 424 | 424 |
| X2X | 2X6 | 9E |
| X2E | 34 | 34 |
| X30 | 2E1 | 1122 |
| X31 | 32E40 | 5686 |
| X32 | 14 | 14 |
| X33 | 30 | 30 |
| X34 | E0X76EX | 83516E2 |
| X35 | 18 | 12 |
| X36 | 5310298 | 4E38E93 |
| X37 | 114 | 258 |
| X38 | 4 | 4 |
| X39 | 40EE8 | 514768 |
| X3X | 39354 | 308X0 |
| X3E | 28 | 12 |
| X40 | 15030 | E219 |
| X41 | 730 | 312 |
| X42 | 8 | 8 |
| X43 | 84E94 | E7846 |
| X44 | 38094 | 43X0 |
| X45 | 6X | 4X |
| X46 | 12 | 12 |
| X47 | X0 | X0 |
| X48 | 358 | 358 |
| X49 | 8X | 8X |
| X4X | E8XX | 3738 |
| X4E | 4 | 4 |
| X50 | 230 | 3X0 |
| X51 | 27E4X2464 | 30028518 |
| X52 | 11X | 98 |
| X53 | 566 | 2058 |
| X54 | 6 | 6 |
| X55 | 18X | 18X |
| X56 | 1234 | 399 |
| X57 | 100 | 100 |
| X58 | X4 | 235 |
| X59 | 740 | 31X |
| X5X | 124428491 | 123708X88 |
| X5E | 8 | 8 |
| X60 | E3 | E3 |
| X61 | 15104 | 49X0 |
| X62 | 4 | 4 |
| X63 | 33X84334X3X | 76X6681094 |
| X64 | 54X | 13E3 |
| X65 | X | X |
| X66 | 78 | 78 |
| X67 | 186 | E2 |
| X68 | 12 | 12 |
| X69 | 1546X0 | 552872 |
| X6X | X50X2406 | 24295435 |
| X6E | 58 | X8 |
| X70 | X1 | X1 |
| X71 | 234 | 10X6 |
| X72 | 34 | 1X4 |
| X73 | 2X71X | 282094 |
| X74 | 49X | 136 |
| X75 | 4 | 4 |
| X76 | 9X352 | 479552 |
| X77 | 7EE80 | 32418 |
| X78 | 8 | 8 |
| X79 | 384 | 384 |
| X7X | 216 | 216 |
| X7E | 378E91XX8 | 64909872 |
| X80 | 451 | 451 |
| X81 | 136XX | 52132 |
| X82 | 18 | 18 |
| X83 | 6 | 6 |
| X84 | X29 | 58 |
| X85 | 194 | 105X |
| X86 | 4XX5 | 27EE |
| X87 | 503X | 1310 |
| X88 | 4 | 4 |
| X89 | 3001EX4 | 405112 |
| X8X | 23 | 23 |
| X8E | 38 | 38 |
| X90 | 5465 | 55532 |
| X91 | 7X | 150 |
| X92 | X | X |
| X93 | 15966 | 2600 |
| X94 | 22E67 | 27556 |
| X95 | 8 | 8 |
| X96 | 439 | 439 |
| X97 | 105304 | 24E430 |
| X98 | 124 | 124 |
| X99 | 122 | 1EX |
| X9X | 1164X | 653563 |
| X9E | 4 | 4 |
| XX0 | 1X1 | 313 |
| XX1 | 354 | 1236 |
| XX2 | 144 | 374 |
| XX3 | 192 | 380 |
| XX4 | 883 | 222 |
| XX5 | 24 | 24 |
| XX6 | 132E7001 | 32271EX0 |
| XX7 | 78X | 668 |
| XX8 | 14 | 11 |
| XX9 | 110 | 110 |
| XXX | 777X | 1333E |
| XXE | XX | XX |
| XE0 | 10 | 10 |
| XE1 | 54E48800 | 12250568 |
| XE2 | 4 | 4 |
| XE3 | 1E776602 | 1X97XE54 |
| XE4 | 1081 | 188 |
| XE5 | 14 | 19X |
| XE6 | 17232 | XE71 |
| XE7 | 716 | 178 |
| XE8 | 14 | 14 |
| XE9 | 3E2 | 12E0 |
| XEX | E767 | 43723 |
| XEE | X | X |
| E00 | 224 | 224 |
Bases E01 to 1000[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| E01 | 806 | 2E8 |
| E02 | 1X | 1X |
| E03 | 147796 | 277928 |
| E04 | E0 | 488 |
| E05 | 4 | 4 |
| E06 | 756 | 371 |
| E07 | 357820 | 9E08 |
| E08 | 4X | 4X |
| E09 | 1X3074 | 402X0X |
| E0X | 19 | 19 |
| E0E | 8 | 8 |
| E10 | 19832804 | X210X42 |
| E11 | 2E4 | 1112 |
| E12 | 12 | 12 |
| E13 | XX8392 | 1079346 |
| E14 | 14907 | E7X85 |
| E15 | 74 | 74 |
| E16 | E0 | 59 |
| E17 | 4E214 | E2892 |
| E18 | 4 | 4 |
| E19 | 264 | 264 |
| E1X | 7602027 | 2491230 |
| E1E | 8 | 12 |
| E20 | 47X4 | 846X |
| E21 | 6 | 6 |
| E22 | 12X | 12X |
| E23 | 78 | EX0 |
| E24 | 32330 | 230X0 |
| E25 | 132 | 1X4 |
| E26 | 14 | 14 |
| E27 | 30X6X | 99938 |
| E28 | 8 | 8 |
| E29 | 17240 | 2410 |
| E2X | 88295X | 321273 |
| E2E | 4 | 4 |
| E30 | 147988 | X1E49 |
| E31 | 17E7E0 | 166002 |
| E32 | 58 | 105 |
| E33 | 102 | 102 |
| E34 | 43 | 12 |
| E35 | 94X | 1X8 |
| E36 | 182E53 | 134215 |
| E37 | 136 | 136 |
| E38 | 14 | 85 |
| E39 | X22 | 118 |
| E3X | 174 | 10E3 |
| E3E | 14 | 9X |
| E40 | 5X | 5X |
| E41 | 16 | 186 |
| E42 | 4 | 4 |
| E43 | 4694X | 4E700 |
| E44 | 20E19 | 1668E |
| E45 | 8 | 8 |
| E46 | 417 | 417 |
| E47 | X4 | 4X0 |
| E48 | 398 | 398 |
| E49 | 33E8 | 33X10 |
| E4X | 630 | 51E |
| E4E | 8 | 12 |
| E50 | 6 | 6 |
| E51 | 31X0X4 | 579E8 |
| E52 | X1 | 52 |
| E53 | 5X76 | 11X1EX |
| E54 | 551 | 202 |
| E55 | 4 | 4 |
| E56 | 450 | 450 |
| E57 | 6E6 | 1652 |
| E58 | 18 | 18 |
| E59 | 9114 | 19652 |
| E5X | 444 | E8E |
| E5E | 1X | 1X |
| E60 | 19X8X9 | 31492E |
| E61 | 377X6 | 2537X2 |
| E62 | 8 | 8 |
| E63 | 70 | 70 |
| E64 | 419 | 318 |
| E65 | 114 | 1E2 |
| E66 | 153X5 | 498X |
| E67 | 279936 | 24028 |
| E68 | 4 | 4 |
| E69 | 42 | 42 |
| E6X | 306664X7X | 3057467E5 |
| E6E | E8 | E8 |
| E70 | 64X9 | 3479 |
| E71 | 11X | 1090 |
| E72 | 3X4 | 72 |
| E73 | 48 | 262 |
| E74 | E0 | 8 |
| E75 | 10X | 28 |
| E76 | 56 | 56 |
| E77 | 959X | 24198 |
| E78 | 21 | 12 |
| E79 | 295E9X | 504E0 |
| E7X | 570 | 570 |
| E7E | 4 | 4 |
| E80 | 706X | 14936 |
| E81 | 1605E24 | 752X50 |
| E82 | X | X |
| E83 | 2898 | 3X76 |
| E84 | 240 | 240 |
| E85 | 1E4 | 1E4 |
| E86 | 502 | 502 |
| E87 | 657X | 1XX00 |
| E88 | 3XX | 3XX |
| E89 | 12 | 12 |
| E8X | 806 | 385 |
| E8E | 3X | 234 |
| E90 | 139110 | 3138E2 |
| E91 | 2X | X0 |
| E92 | 4 | 4 |
| E93 | 451694 | 880292 |
| E94 | 31399 | 19E239 |
| E95 | 134 | 1E8 |
| E96 | 394 | 8X |
| E97 | 14 | 100 |
| E98 | 8 | 8 |
| E99 | 342 | 342 |
| E9X | 199 | 199 |
| E9E | 5X | 258 |
| EX0 | 19 | 19 |
| EX1 | 65X54X | 4E93602 |
| EX2 | 3E4 | 3E4 |
| EX3 | 52 | 52 |
| EX4 | 25807 | 1E1E8 |
| EX5 | 4 | 4 |
| EX6 | 99 | 99 |
| EX7 | 21E40 | 4X782 |
| EX8 | 32 | 311 |
| EX9 | 32 | 132X |
| EXX | 6 | 6 |
| EXE | X | X |
| EE0 | 14E | 14E |
| EE1 | 2E89E6 | 133E78 |
| EE2 | 13X | 13X |
| EE3 | 38 | 38 |
| EE4 | 98369736 | 18X025916 |
| EE5 | 8 | 8 |
| EE6 | 5996E | 2XX94E |
| EE7 | 38XX | 19848 |
| EE8 | 4 | 4 |
| EE9 | 193256 | 1662XX |
| EEX | 334 | 1333 |
| EEE | 214 | 1084 |
| 1000 | 18 | 18 |
Extra square bases up to 402 and extra power-of-2 bases up to 210[]
| base | conjectured smallest Sierpinski number | conjectured smallest Riesel number |
| 1030 = 362 | 256 | 256 |
| 10X1 = 372 | 30 | 4X8 |
| 1154 = 382 | 419 | 419 |
| 1209 = 392 | 394 | 124 |
| 1228 = 2E | 23X | 25 |
| 1284 = 3X2 | 203 | 270 |
| 1341 = 3E2 | 14 | 12 |
| 1400 = 402 | 649 | 649 |
| 2454 = 210 | 846 | 3068 |