%I #11 Oct 20 2023 08:39:42
%S 446,7164,33534576,8522776512,120292503552,2305842741852438528,
%T 2658455991569831740043006737112629248,
%U 191561942608236101977881394944640151127455097780436992
%N Second differences of perfect numbers A000396.
%H Paolo Xausa, <a href="/A139230/b139230.txt">Table of n, a(n) for n = 1..13</a>
%F a(n) = A139228(n+1) - A139228(n). - _Jinyuan Wang_, Mar 04 2020
%t Differences[PerfectNumber[Range[12]],2] (* _Paolo Xausa_, Oct 20 2023 *)
%Y Cf. A000396, A139228, A139229, A139231, A139232, A139233, 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