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

31, 8191, 2305843009213693951, 14474011154664524427946373126085988481658748083205070504932198000989141204991

Offset: 1

Author

Omar E. Pol, Apr 13 2008

Keywords

• nonn

Crossrefs

Cf. A000668, A139294, A139296, A139297, A139298, A139299, A139300, A139301, A139302, A139303, A139304, A139305, A139306.

Programs

Mathematica

a[n_] := 2^(2^(MersennePrimeExponent[n] + 1) - 3) - 1; Array[a, 4] (* Amiram Eldar, Jul 10 2025 *)

Formula

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