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 A128856 #3 Mar 30 2012 17:26:59 %S A128856 0,1,71,21,45,12,64,6,5,280,11,121,638185,62,8,76,9,7,10 %N A128856 Index of first appearance of n in A062347. %C A128856 a(20) > pi(10^7)=664579 %F A128856 a(n) = smallest m such that A062347(m)=n. %K A128856 nonn %O A128856 1,3 %A A128856 _Zak Seidov_, Apr 16 2007, revised Apr 17 2007 %E A128856 More terms from _Max Alekseyev_, Apr 20 2007