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 A093075 #4 Mar 30 2012 18:50:43 %S A093075 1,1,0,1,0,1,0,-1,1,1,0,1,0,-1,-1,1,0,1,0,-1,1,1,0,-1,1,0,-1,1,0,1,0, %T A093075 -1,1,0,-1,1,0,-1,-1,1,0,1,0,-1,1,1,0,-1,0,1,0,1,0,-1,0,1,1,1,0,1,0, %U A093075 -1,-1,1,0,1,0,-1,0,1,0,1,0,-1,-1,0,-1,1,0,-1,1,1,0,-1,1,0,-1,1,0,-1 %N A093075 Indicating the neighbor with a greater greatest prime factor. %C A093075 A093074(n)=A006530(n+a(n)); A006530(n)<=A006530(n+a(n)). %K A093075 sign %O A093075 1,1 %A A093075 _Reinhard Zumkeller_, Mar 18 2004