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Second differences of perfect numbers A000396, divided by 2.
11

%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