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%I #11 Dec 14 2016 11:01:06
%S 1,1,3,1,1,1,1,1,9,5,1,1,1,1,3,1,1,1,1,1,3,1,1,1,1,1,27,1,1,5,1,1,3,1,
%T 1,1,1,1,3,1,1,1,1,1,9,1,1,1,1,25,3,1,1,1,11,1,3,1,1,1,1,1,9,1,1,1,1,
%U 17,3,5,1,1,1,1,3,1,1,13,1,1,81,1,1,1,1,1,3,1,1,5,1,1,3,1,1,1,1,1,9,1
%N a(n) = gcd(n, 2^n + 1).
%C First occurrence of n: a(1)=1, a(3)=3, a(10)=5, a(9)=9, a(55)=11, a(78)=13, a(68)=17, a(50)=25, a(27)=27, a(406)=29, a(165)=33, a(666)=37, a(301)=43, a(1378)=53, a(1711)=59, a(390)=65, a(81)=81, a(3403)=83, a(2328)=97, a(495)=99, ... - _R. J. Mathar_, Dec 14 2016
%t Table[GCD[n,2^n+1],{n,100}] (* _Harvey P. Dale_, Dec 12 2012 *)
%Y Cf. A014491, A049095, A049096, A060444.
%K nonn
%O 1,3
%A _Vladeta Jovovic_, Apr 12 2002
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