A139235 First differences of even superperfect numbers A061652, divided by 2.

1, 6, 24, 2016, 30720, 98304, 536739840, 576460751766552576, 154742504334211782058967040, 40564664464798430175360140181504, 42535255300298100629580978034468454400

Offset

1,2

Comments

First differences of Mersenne primes A000668, divided by 4 (see A139231).

Also, first differences of superperfect numbers A019279, divided by 2, if there are no odd superperfect numbers.

Links

Paolo Xausa, Table of n, a(n) for n = 1..17

Formula

a(n) = A139234(n)/2.

Mathematica

Differences[2^MersennePrimeExponent[Range[14]]-1]/4 (* Paolo Xausa, Oct 20 2023 *)

Crossrefs

Cf. A000668, A019279, A061652, A139228, A139229, A139230, A139231, A139232, A139233, A139234, A139236, A139237.

Sequence in context: A267032 A234635 A036284 * A184388 A136606 A074096

Adjacent sequences: A139232 A139233 A139234 * A139236 A139237 A139238

Keyword

nonn

Author

Omar E. Pol, Apr 18 2008

Extensions

a(8)-a(11) from Jinyuan Wang, Mar 04 2020

Status

approved