%I A067718
%S A067718 1,2,6,12,24,36,42,70,126,132,144,168,210,225,252
%N A067718 Numbers n such that sigma(2^n+1)==0 (mod n).
%o A067718 (PARI) for(n=1,260,if(sigma(2^n+1)%n==0,print1(n,","))) (Brockhaus)
%Y A067718 Sequence in context: A137895 A099993 A011778 this_sequence A028923 A001116 
               A002336
%Y A067718 Adjacent sequences: A067715 A067716 A067717 this_sequence A067719 A067720 
               A067721
%K A067718 nonn
%O A067718 1,2
%A A067718 Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 05 2002
%E A067718 a(13) to a(15) from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) 
               Apr 13 2005