A139241 Second differences of Mersenne numbers A001348.

20, 72, 1824, 4224, 116736, 270336, 7471104, 520617984, 1082130432, 133680857088, 1926292832256, 4535485464576, 125344325566464, 8734520371052544, 558587091282296832, 1161928703861587968, 143538727323552448512, 2068341179264683474944, 4869940435459321626624

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, A139230, A139232, A139236, A139238, A139242, A139243.

Programs

Mathematica

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

PARI

a(n) = 2^prime(n+2)-2^(prime(n+1)+1)+2^prime(n); \\ Michel Marcus, Mar 13 2020

Formula

a(n) = 2^prime(n+2)-2^(prime(n+1)+1)+2^prime(n). - Michel Marcus, Mar 13 2020

Extensions

More terms from Alois P. Heinz, Mar 13 2020