OFFSET
1,2
COMMENTS
For all m, 2^A128124(m)-1 belongs to this sequence.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
OEIS Wiki, 2^n mod n
MATHEMATICA
m = 2^11; Join[Select[Range[m], Divisible[2^# - m, #] &],
Select[Range[m + 1, 10^6], PowerMod[2, #, #] == m &]] (* Robert Price, Oct 08 2018 *)
PROG
(PARI) isok(n) = Mod(2, n)^n == Mod(2, n)^11; \\ Michel Marcus, Oct 08 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Edited by Max Alekseyev, Jul 30 2011
STATUS
approved