A139235 - OEIS

A139235

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

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

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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