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 A232703 #12 Aug 15 2021 02:14:44
%S A232703 1,2,185,113125,535350201,71373089217,82225037115,156231750533,
%T A232703 268821356379
%N A232703 Numbers k that divide sigma(k) + sigma(k^2).
%C A232703 a(10) > 10^12. - _Giovanni Resta_, Jun 10 2016
%t A232703 Select[Range[150000], Mod[Plus @@ DivisorSigma[1, {#, #^2}], #] == 0 &] (* _Giovanni Resta_, Jun 10 2016 *)
%Y A232703 Cf. A000203 (sigma(n) = sum of divisors of n).
%Y A232703 Cf. A232547, A065764, A247222.
%K A232703 nonn,hard,more
%O A232703 1,2
%A A232703 _Alex Ratushnyak_, Nov 28 2013
%E A232703 a(6)-a(9) from _Giovanni Resta_, Jun 10 2016