A015925 Positive integers n such that 2^n == 2^5 (mod n).

1, 2, 3, 4, 5, 8, 14, 16, 25, 32, 56, 65, 85, 145, 165, 185, 205, 221, 224, 265, 305, 365, 368, 445, 465, 485, 505, 545, 565, 685, 745, 785, 825, 865, 905, 965, 985, 1022, 1025, 1085, 1145, 1165, 1205, 1285, 1316, 1345, 1385, 1405, 1424, 1465, 1565, 1585, 1685, 1705, 1745

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn

Comments

For all m, 2^A128122(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 A050993 as a subsequence.

The odd terms form A276968.

Programs

Mathematica

m = 32; Join[Select[Range[m], Divisible[2^# - m, #] &],
Select[Range[m + 1, 10^6], PowerMod[2, #, #] == m &]] (* Robert Price, Oct 08 2018 *)

Extensions

Edited by Max Alekseyev, Jul 30 2011