A139304 a(n) = 2^(2p - 1)/32, where p is the n-th Mersenne prime A000668(n).

1, 256, 72057594037927936, 452312848583266388373324160190187140051835877600158453279131187530910662656

Offset: 1

Author

Omar E. Pol, Apr 13 2008

Keywords

• nonn

Crossrefs

Cf. A000668, A139294, A139295, A139296, A139297, A139298, A139299, A139300, A139301, A139302, A139303, A139305, A139306.

Programs

Mathematica

a[n_] := 2^(2^(MersennePrimeExponent[n] + 1) - 8); Array[a, 4] (* Amiram Eldar, Jul 10 2025 *)

Formula

a(n) = 2^(2*A000668(n)-1)/32 = A139294(n)/32.

Extensions

a(4) from Amiram Eldar, Jul 10 2025