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 A216502 #26 Mar 02 2019 11:58:11 %S A216502 1,10,11,13,14,15,18,39,59,99,106,107,147,189,999,1049,1059,1199,1399, %T A216502 1599,2999,10669,10679,11789,12799,12899,16779,17899,18899 %N A216502 Indices of record values in A216476. %o A216502 (PARI) m=0;for(n=1,9e9,m<(m=max(A216476(n),m))&print1(n",")) %K A216502 nonn,base,more %O A216502 1,2 %A A216502 _M. F. Hasler_, Sep 11 2012 %E A216502 a(24)-a(29) from _Charlie Neder_, Feb 26 2019