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

Author

Omar E. Pol, Apr 19 2008

Keywords

• easy
• nonn

Links

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

Crossrefs

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

Programs

Mathematica

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

Formula

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

Extensions

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