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A139233 Second differences of perfect numbers A000396, divided by 2. 11
223, 3582, 16767288, 4261388256, 60146251776, 1152921370926219264, 1329227995784915870021503368556314624, 95780971304118050988940697472320075563727548890218496 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = A139230(n)/2.
MATHEMATICA
Differences[PerfectNumber[Range[12]], 2]/2 (* Paolo Xausa, Oct 20 2023 *)
CROSSREFS
Sequence in context: A205273 A205266 A152834 * A205265 A153165 A094491
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 March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)