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 A115917 #5 Jul 15 2021 21:25:29 %S A115917 6,10,49,242,289,512,578,800,900,1250,2048,5041,15625,17424,22201, %T A115917 22472,26450,28900,48400,60025,62001,65536,69169,91592,131072,144722, %U A115917 146689,151321,160801,201601,212521,236196,242064,252050,253009 %N A115917 Numbers k such that sigma(k) - phi(k) is a brilliant number (A078972). %e A115917 sigma(62001) - phi(62001) = 49813 = 109*457. %Y A115917 Cf. A078972, A115916. %K A115917 nonn,base %O A115917 1,1 %A A115917 _Giovanni Resta_, Feb 06 2006