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 A215195 #22 Nov 09 2014 08:05:53 %S A215195 1,598,1498,54797260 %N A215195 Numbers n such that A143615(n) = sigma(n) where sigma(n) = A000203(n). %C A215195 a(5) (if it exists) > 10^8. - _Hiroaki Yamanouchi_, Sep 11 2014 %o A215195 (PARI) isok(n) = sum(m=1, n, if (gcd(n,m)==1, numdiv(m))) == sigma(n); \\ _Michel Marcus_, Nov 08 2014 %Y A215195 Cf. A000203, A143615. %K A215195 nonn,more %O A215195 1,2 %A A215195 _Naohiro Nomoto_, Aug 05 2012 %E A215195 a(4) from _Hiroaki Yamanouchi_, Sep 11 2014