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 A097222 #3 Mar 30 2012 17:37:42 %S A097222 15,27,39,130,131,252,370,489,1195,2345,3484,4619,5752,6879 %N A097222 Numbers n such that for some k there exist k numbers a1,a2, ...,ak that concatenations of them is equal to n and sum of them is equal to Pi(n). %e A097222 9642459 is in the sequence because Pi(9642459)=9+642459 %e A097222 in fact a1=9 & a2=642459. %Y A097222 Cf. A097220, A097221. %K A097222 nonn,base %O A097222 1,1 %A A097222 _Farideh Firoozbakht_, Aug 05 2004