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A139299 2^(2p - 1)/4-1, where p is a Mersenne prime A000668(n). 3

%I

%S 7,2047,576460752303423487

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

%F a(n) = 2^(2*A000668(n)-1)/4-1 = A139294(n)/4-1 = A139298(n)-1.

%K bref,nonn

%O 1,1

%A _Omar E. Pol_, Apr 13 2008

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Last modified March 24 01:20 EDT 2019. Contains 321444 sequences. (Running on oeis4.)