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In number theory, a prime number is called weakly prime if it becomes not prime when any one of its digits is changed to every single other digit. The smallest weakly prime is 6E8XE77, since none of 0E8XE77, 1E8XE77, 2E8XE77, ..., 6E8XE7E are primes.

b smallest weakly prime base b (written in base b) smallest weakly prime base b (written in base 10)
2 1111111 X7
3 2 2
4 11311 271
5 313 6E
6 334155 1435E
7 436 167
8 14103 3717
9 3738 1745
X 294001 122181
E 2573 1E2E
10 6E8XE77 6E8XE77
11 2:2:1:6 28EE
12 10:3:7:1:10:11 2258E01
13 9:8:8::12 1E441E
14 11:2:X:4:5 357371
15 2:2:6:7 6101
16 3:7:2:3:11:12:9:1 4X0286X17
17 1:E:4:3 6391
18 2:10:16:13:5:10:9 48895861
19 12:X:15:13:E E4193E
1X 2:7:19:11:6:1:3 75874475
1E 5:12:11:3 337EE
20 9:5:15:10:17:X:8:10:7 1451161XXX07
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