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 A133797 #5 Oct 13 2021 15:03:30 %S A133797 0,1,1,3,3,3,12,7,7,12,15,15,15,28,15,72,31,31,60,31,72,91,63,63,124, %T A133797 63,168,91,312,127,127,252,127,360,195,312,255,255,255,508,255,744, %U A133797 403,728,255,1240,511,511,1020,511,1512,819,1560,511,1240,1860 %N A133797 Apply the map n -> sigma(phi(n)) to A023758. %Y A133797 Cf. A023758, A062402. %K A133797 nonn %O A133797 1,4 %A A133797 _J. H. Conway_, Jan 05 2008