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A139230 Second differences of perfect numbers A000396. 10
446, 7164, 33534576, 8522776512, 120292503552, 2305842741852438528, 2658455991569831740043006737112629248, 191561942608236101977881394944640151127455097780436992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

FORMULA

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

CROSSREFS

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

Sequence in context: A160583 A025354 A025346 * A221506 A065576 A200071

Adjacent sequences:  A139227 A139228 A139229 * A139231 A139232 A139233

KEYWORD

nonn

AUTHOR

Omar E. Pol, Apr 19 2008

EXTENSIONS

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

STATUS

approved

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Last modified April 7 13:17 EDT 2020. Contains 333305 sequences. (Running on oeis4.)