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%I #14 Oct 20 2023 08:39:14
%S 223,3582,16767288,4261388256,60146251776,1152921370926219264,
%T 1329227995784915870021503368556314624,
%U 95780971304118050988940697472320075563727548890218496
%N Second differences of perfect numbers A000396, divided by 2.
%H Paolo Xausa, <a href="/A139233/b139233.txt">Table of n, a(n) for n = 1..13</a>
%F a(n) = A139230(n)/2.
%t Differences[PerfectNumber[Range[12]],2]/2 (* _Paolo Xausa_, Oct 20 2023 *)
%Y Cf. A000396, A139228, A139229, A139230, A139231, A139232, A139234, A139235, A139236, A139237.
%K nonn
%O 1,1
%A _Omar E. Pol_, Apr 19 2008
%E a(5)-a(8) from _Jinyuan Wang_, Mar 04 2020
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