A015927 Positive integers n such that 2^n == 2^7 (mod n).

1, 2, 3, 4, 7, 8, 15, 16, 28, 32, 49, 62, 64, 91, 112, 128, 133, 196, 217, 255, 259, 301, 427, 448, 469, 511, 527, 553, 679, 721, 763, 784, 889, 973, 992, 1015, 1057, 1099, 1141, 1168, 1267, 1351, 1393, 1477, 1561, 1603, 1687, 1897, 1939, 1981, 2107, 2149, 2191, 2317, 2359, 2443, 2569, 2611, 2653

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn

Comments

For all m, 2^A015922(m)-1 belongs to this sequence.

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..10000
• OEIS Wiki, 2^n mod n

Crossrefs

Contains A208155 as a subsequence.

The odd terms form A276969.

Programs

Mathematica

Select[Range[3000],PowerMod[2,#,#]==PowerMod[2,7,#]&] (* Harvey P. Dale, Mar 15 2018 *)

Extensions

Edited by Max Alekseyev, Jul 30 2011