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%I #14 Mar 30 2012 18:52:39
%S 1,5,6,8,34,131
%N Numbers n such that for p=prime(n), (2p-1)^(2p-1) mod 2^(2p-1) is prime.
%e 5 is in the sequence, since prime(5)=11 and (2*11-1)^(2*11-1) mod 2^(2*11-1) = 21^21 mod 2^21 = 1472837 is prime.
%Y Cf. A000040, A000079, A000312, A178537, A178966.
%K nonn
%O 1,2
%A _Juri-Stepan Gerasimov_, Jan 01 2011