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J.J.Tattersall defined the Curzon numbers to be those N for which 2N+1 divides (2^N)+1.

The first Curzon numbers are: 1, 2, 5, 6, 9, 14, 18, 25, 26, 29, 34, 41, 50, 65, 66, 68, 81, 82, 85, 86, 89, 96, 97, 99, 100, 106, 113, 116, 129, 130, 132, 145, 149, 161, 162, 169, 170, 173, 178, 181, 194, 197, 200, 201, 209, 221, 225, 226, 228, 241, 242, ...

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