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

1, 256, 72057594037927936, 452312848583266388373324160190187140051835877600158453279131187530910662656

Offset

1,2

Links

Table of n, a(n) for n=1..4.

Formula

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

Mathematica

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

Crossrefs

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

Sequence in context: A185981 A255321 A228133 * A018859 A180699 A195529

Adjacent sequences: A139301 A139302 A139303 * A139305 A139306 A139307

Keyword

nonn

Author

Omar E. Pol, Apr 13 2008

Extensions

a(4) from Amiram Eldar, Jul 10 2025

Status

approved