OFFSET
1,2
COMMENTS
Also, integers n such that 2^(n-11) == 1 (mod n).
For all m, 2^A128124(m)-1 belongs to this sequence.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
MATHEMATICA
m = 2^11; Join[Select[Range[1, m, 2], Divisible[2^# - m, #] &],
Select[Range[m + 1, 10^6, 2], PowerMod[2, #, #] == m &]] (* Robert Price, Oct 12 2018 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Max Alekseyev, Sep 22 2016
STATUS
approved