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 A071086 #5 Mar 30 2012 18:39:00 %S A071086 0,1,0,1,1,1,0,1,0,5,0,1,0,1,2,1,1,1,0,6,0,1,0,1,1,3,0,1,0,7,0,1,0,2, %T A071086 1,1,1,1,1,6,0,1,0,1,2,1,0,1,0,6,1,3,0,1,1,1,0,3,0,8,0,1,0,1,4,1,0,3, %U A071086 0,6,0,1,0,2,2,1,0,4,0,6,0,2,0,1,3,1,0,1,0,7,0,1,0,1,1,1,0,1,0,7,1,3,0,3,2 %N A071086 Number of integers of the form (nk)^2/(n^2+k^2), k>=1. %o A071086 (PARI) for(n=1,100,print1(sum(i=1,n^2,if((n*i)^2%(i^2+n^2),0,1)),",")) %K A071086 easy,nonn %O A071086 1,10 %A A071086 _Benoit Cloitre_, May 26 2002