|
%I #6 Dec 09 2013 17:34:51
%S 1,763425,10888425,40068105,142086921,191345625,462784725,468545025,
%T 552451809,595018305,683993905,956917125,1013987349,1024992045,
%U 1567781325,1581567885,3094868865,3312888345,4839991545,4882263477,5064476505,5613455925,7303900125
%N Odd numbers n such that 2n-1 divides 2^n-1.
%C These seem to be much rarer than the corresponding even numbers.
%H Charles R Greathouse IV, <a href="/A233415/b233415.txt">Table of n, a(n) for n = 1..51</a>
%o (PARI) is(n)=n%2 && Mod(2, 2*n-1)^n==1
%Y Subsequence of A081856.
%K nonn
%O 1,2
%A _Charles R Greathouse IV_, Dec 09 2013
|
