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 A237522 #11 Jul 14 2021 10:03:47 %S A237522 25,165261124,1698757933 %N A237522 Numbers k such that phi(k) + sigma(k) = reversal(k) - 1. %C A237522 a(4), if it exists, is larger than 10^13. %e A237522 k = 165261124 is a term, because phi(k) = 67233600, sigma(k) = 353928960 and 67233600 + 353928960 = 421162561 - 1, where 421162561 is the reversal of 165261124. %Y A237522 Cf. A000010, A000203, A004086. %Y A237522 Cf. A070272, A230004, A230005, A230006, A230019, A136544, A237521. %K A237522 base,nonn,bref,more %O A237522 1,1 %A A237522 _Giovanni Resta_, Feb 08 2014