%I A087966
%S A087966 1,1,1,1,1,9,1,1,1,1,1,9,1,1,1,1,1,27,1,25,49,1,1,9,1,1,1,1,1,9,1,1,1,
               1,
%T A087966 1,27,1,1,1,25,1,441,1,1,1,1,1,9,1,1,1,1,1,81,1,1,1,1,1,225,1,1,49,1,1,
%U A087966 9,1,1,1,1,1,27,1,1,1,1,1,9,1,25,1,1,1,441,1,1,1,1,1,27,1,1,1,1,1,9,1,
               1
%N A087966 a(n)=GCD[ -1+2^n, n^2].
%e A087966 n=6: GCD[64-1,36]=9=a(6)
%Y A087966 Sequence in context: A010534 A078297 A113061 this_sequence A087968 A110483 
               A010164
%Y A087966 Adjacent sequences: A087963 A087964 A087965 this_sequence A087967 A087968 
               A087969
%K A087966 nonn
%O A087966 1,6
%A A087966 Labos E. (labos(AT)ana.sote.hu), Sep 22 2003