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%I #12 Sep 08 2022 08:45:15
%S 1,3,19,34,51,318,3670,6348
%N Numbers k such that 4^k*(2^k - 1) + 1 is a prime.
%C a(9) > 11500. - _Jinyuan Wang_, Mar 19 2020
%o (Magma) [k: k in [1..500] | IsPrime(4^k*(2^k-1)+1)]; // _Jinyuan Wang_, Mar 19 2020
%Y Cf. A098857 ((4^k)*(2^k - 1) - 1 is prime).
%K nonn,more
%O 1,2
%A _Pierre CAMI_, Oct 11 2004
%E 6348, corresponding to a probable prime, from _Ryan Propper_, Jun 18 2005
%E Edited by _T. D. Noe_, Oct 30 2008
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