A139242 Second differences of Mersenne numbers A001348, divided by 2.

10, 36, 912, 2112, 58368, 135168, 3735552, 260308992, 541065216, 66840428544, 963146416128, 2267742732288, 62672162783232, 4367260185526272, 279293545641148416, 580964351930793984, 71769363661776224256, 1034170589632341737472, 2434970217729660813312

Offset

1,1

Links

Paolo Xausa, Table of n, a(n) for n = 1..450

Formula

a(n) = A139241(n)/2.

Mathematica

Differences[2^Prime[Range[25]]-1, 2]/2 (* Paolo Xausa, Oct 20 2023 *)

Crossrefs

Cf. A001348, A139233, A139237, A139238, A139239, A139240, A139241, A139243.

Sequence in context: A264486 A220199 A089222 * A139236 A212795 A227695

Adjacent sequences: A139239 A139240 A139241 * A139243 A139244 A139245

Keyword

easy,nonn

Author

Omar E. Pol, Apr 19 2008

Extensions

Corrected and extended by Alois P. Heinz, Mar 13 2020

Status

approved