A139230 Second differences of perfect numbers A000396.

446, 7164, 33534576, 8522776512, 120292503552, 2305842741852438528, 2658455991569831740043006737112629248, 191561942608236101977881394944640151127455097780436992

Offset: 1

Author

Omar E. Pol, Apr 19 2008

Keywords

• nonn

Links

• Paolo Xausa, Table of n, a(n) for n = 1..13

Crossrefs

Cf. A000396, A139228, A139229, A139231, A139232, A139233, A139234, A139235, A139236, A139237.

Programs

Mathematica

Differences[PerfectNumber[Range[12]],2] (* Paolo Xausa, Oct 20 2023 *)

Formula

a(n) = A139228(n+1) - A139228(n). - Jinyuan Wang, Mar 04 2020

Extensions

a(5)-a(8) from Jinyuan Wang, Mar 04 2020