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A015925 Positive integers n such that 2^n == 2^5 (mod n). 11

%I #21 Oct 08 2018 18:13:49

%S 1,2,3,4,5,8,14,16,25,32,56,65,85,145,165,185,205,221,224,265,305,365,

%T 368,445,465,485,505,545,565,685,745,785,825,865,905,965,985,1022,

%U 1025,1085,1145,1165,1205,1285,1316,1345,1385,1405,1424,1465,1565,1585,1685,1705,1745

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

%C For all m, 2^A128122(m)-1 belongs to this sequence.

%H Seiichi Manyama, <a href="/A015925/b015925.txt">Table of n, a(n) for n = 1..10000</a>

%H OEIS Wiki, <a href="/wiki/2^n mod n">2^n mod n</a>

%t m = 32; Join[Select[Range[m], Divisible[2^# - m, #] &],

%t Select[Range[m + 1, 10^6], PowerMod[2, #, #] == m &]] (* _Robert Price_, Oct 08 2018 *)

%Y Contains A050993 as a subsequence.

%Y The odd terms form A276968.

%K nonn

%O 1,2

%A _Robert G. Wilson v_

%E Edited by _Max Alekseyev_, Jul 30 2011

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Last modified May 11 04:01 EDT 2024. Contains 372388 sequences. (Running on oeis4.)