A139240 First differences of Mersenne numbers A001348, divided by 4.

1, 6, 24, 480, 1536, 30720, 98304, 1966080, 132120576, 402653184, 33822867456, 515396075520, 1649267441664, 32985348833280, 2216615441596416, 141863388262170624, 432345564227567616, 36317027395115679744, 553402322211286548480, 1770887431076116955136, 148754544210393824231424

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, A139237, A139238, A139239, A139243.

Programs

Mathematica

Differences[2^Prime[Range[25]]-1]/4 (* Paolo Xausa, Oct 20 2023 *)

PARI

a(n)=my(p=prime(n));(2^nextprime(p+1)-2^p)/4 \\ Charles R Greathouse IV, Jan 03 2013

Formula

a(n) = A139238(n)/4 = A139239(n)/2.

Extensions

a(10)-a(21) from Paolo Xausa, Oct 20 2023