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%I #8 Apr 11 2022 17:58:59
%S 1,4,64,1024,262144,4194304,1073741824,17179869184,4398046511104,
%T 18014398509481984,288230376151711744,1180591620717411303424,
%U 302231454903657293676544,4835703278458516698824704
%N 2^(2p - 1)/8, where p is prime.
%F a(n) = A139286(n)/8.
%t 2^(2#-1)/8&/@Prime[Range[20]] (* _Harvey P. Dale_, Aug 19 2012 *)
%Y Cf. A139286, A139287, A139288, A139289, A139290, A139291, A139293, A139294, A139306.
%K nonn
%O 1,2
%A _Omar E. Pol_, Apr 13 2008
%E More terms from _Jon E. Schoenfield_, Jul 16 2010
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