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A139230
Second differences of perfect numbers
A000396
.
11
446, 7164, 33534576, 8522776512, 120292503552, 2305842741852438528, 2658455991569831740043006737112629248, 191561942608236101977881394944640151127455097780436992
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OFFSET
1,1
LINKS
Paolo Xausa,
Table of n, a(n) for n = 1..13
FORMULA
a(n) =
A139228
(n+1) -
A139228
(n). -
Jinyuan Wang
, Mar 04 2020
MATHEMATICA
Differences[PerfectNumber[Range[12]], 2] (*
Paolo Xausa
, Oct 20 2023 *)
CROSSREFS
Cf.
A000396
,
A139228
,
A139229
,
A139231
,
A139232
,
A139233
,
A139234
,
A139235
,
A139236
,
A139237
.
Sequence in context:
A340151
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 August 18 19:26 EDT 2024. Contains 375273 sequences. (Running on oeis4.)