This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A307741 #15 May 12 2024 00:46:11
%S A307741 1,12,56,360,992,2016,16256,120960,131040,1571328,8714160,94279680,
%T A307741 67100672,182131200,571963392,1379454720,5517818880,4428914688,
%U A307741 17179738112,70912195200,159991977600,175445913600,153003540480,265734881280,274877382656,612014161920
%N A307741 Sum of divisors of the multiply-perfect numbers.
%C A307741 When sorted, this is A081756. - _N. J. A. Sloane_, May 03 2019
%H A307741 Amiram Eldar, <a href="/A307741/b307741.txt">Table of n, a(n) for n = 1..730</a>
%F A307741 a(n) = sigma(A007691(n)) = A000203(A007691(n)).
%F A307741 a(n) = A007691(n) * A054030(n).
%e A307741 For n = 3; a(3) = sigma(A007691(3)) = sigma(28) = 56.
%o A307741 (Magma) [SumOfDivisors(n): n in [1..1000000] | IsIntegral(SumOfDivisors(n)/n)]
%o A307741 (PARI) lista(nn) = {for (n=1, nn, my(s=sigma(n)); if (! (s % n), print1(s, ", ")););} \\ _Michel Marcus_, Apr 26 2019
%Y A307741 Cf. A000203, A007691, A054030, A088843 (tau(A007691)), A139256.
%Y A307741 See also A081756.
%K A307741 nonn
%O A307741 1,2
%A A307741 _Jaroslav Krizek_, Apr 26 2019