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 A232704 #7 Dec 01 2013 13:20:34 %S A232704 84889,376443,1260615,2703555,4883751,7551847,8894695,9387081, %T A232704 10142181,12600825,39450985,57924711,72978693,73534503,166503105, %U A232704 428777995,563715879,578643967,583540893,1181555907,1598569785,1779455211,2917138191,3078534559,3318534361 %N A232704 Numbers n such that sigma(n)+n divides sigma(n^2). %o A232704 (PARI) for(n=1, 10^8, if(sigma(n^2)%(sigma(n)+n)==0, print1(n ", "))) \\ _Donovan Johnson_, Nov 30 2013 %Y A232704 Cf. A000203 (sigma(n) = sum of divisors of n). %Y A232704 Cf. A232547, A232703. %K A232704 nonn %O A232704 1,1 %A A232704 _Alex Ratushnyak_, Nov 28 2013 %E A232704 a(23)-a(25) from _Donovan Johnson_, Nov 30 2013