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A139295 2^(2p - 1)-1, where p is a Mersenne prime A000668(n). 4

%I

%S 31,8191,2305843009213693951,

%T 14474011154664524427946373126085988481658748083205070504932198000989141204991

%N 2^(2p - 1)-1, where p is a Mersenne prime A000668(n).

%F a(n) = 2^(2*A000668(n)-1)-1 = A139294(n)-1.

%K nonn

%O 1,1

%A _Omar E. Pol_, Apr 13 2008

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Last modified August 4 19:32 EDT 2020. Contains 336202 sequences. (Running on oeis4.)