A357125 - OEIS

%I #10 Sep 13 2022 13:05:24

%S 1,5,4553,46777,82505,4290773,4492205,4976429,21537833,21549349,

%T 51127261,56786089,60296573,80837773,87761789,94424465,138644873,

%U 168865001,221395541,255881453,297460453,305198249,360306365,562654205,635374253,673867253,808333573,1164757553,1210317349

%N Positive integers n such that 2^(n-3) == -1 (mod n).

%C Also, odd integers n dividing 2^n + 8.

%C Some large terms: 5603900696716667005, 446661376165868432471569407934747098747181600670953926245, 1533278864164902082788937853692280620552397221686019535813.

%H Max Alekseyev, <a href="/A357125/b357125.txt">Table of n, a(n) for n = 1..781</a> (all terms below 10^15)

%Y The odd terms of A245319.

%Y Cf. A006521, A115976, A276967, A251603.

%K nonn

%O 1,2

%A _Max Alekseyev_, Sep 13 2022