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%I #8 Apr 03 2014 03:40:39
%S 1,3490575,83972646,414180489,476072025,1881147720,3020243916,
%T 3188924769,3285167214,3543143220
%N Integers n such that 2n^k + 1, for k = 2..7, are prime.
%C First n>1 such that 2n^k+1, for k=2..8, are prime, is a(3) = 83972646.
%C Subsequence of A240099: a(2) = 3490575 = A240099(4), a(3) = 83972646 = A240099(22).
%Y Cf. A089001, A168550, A239874, A239925, A240099.
%K nonn,more
%O 1,2
%A _Zak Seidov_, Apr 01 2014