login
Numbers n such that 2^n == sigma(n) (mod n).
0

%I #36 Dec 11 2016 23:43:05

%S 1,12,286,5978,111136,283584,339379,1102652,8830498,27952828,30442612,

%T 84638560,90619592,101907952,175917947

%N Numbers n such that 2^n == sigma(n) (mod n).

%C Numbers n such that A015910(n) = A054024(n). - _Michel Marcus_, Dec 11 2016

%e 12 is a term because 2^12 == sigma(12) (mod 12).

%o (PARI) is(n)=Mod(2, n)^n==sigma(n);

%Y Cf. A000079, A000203, A015910, A054024.

%K nonn,more

%O 1,2

%A _Altug Alkan_, Dec 11 2016