A139242 - OEIS

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A139242

Second differences of Mersenne numbers A001348, divided by 2.

5

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

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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