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 A033852 #20 Jul 20 2020 02:01:19 %S A033852 35,105,248,418,594,744,812,1254 %N A033852 Integers k such that j(k)*phi(k) = sigma(k), where j(n) = A033831(n). %C A033852 a(9) > 10^7. - _Michel Marcus_, Nov 05 2014 %C A033852 a(9) > 10^8. - _Manfred Scheucher_, May 30 2015 %o A033852 (PARI) isok(n) = sumdiv(n, d, (d>=3) && (q=n/d) && (q>=1) && (q<=d-2))*eulerphi(n) == sigma(n); \\ _Michel Marcus_, Nov 05 2014 %Y A033852 Cf. A000010 (phi), A000203 (sigma), A033831. %K A033852 more,nonn %O A033852 1,1 %A A033852 _Naohiro Nomoto_