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 A141246 #2 Mar 30 2012 17:22:50 %S A141246 5,11,13,17,19,23,29,47,73,83,89,103,109,113,139,173,181,199,271,283, %T A141246 293,313,383,389,467 %N A141246 Prime numbers related to maximal visibility in the square n X n lattice. %C A141246 The numbers in A141226 greater than 3 are 2*a(n)+1. %K A141246 nonn %O A141246 1,1 %A A141246 _T. D. Noe_, Jun 17 2008