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 A141250 #4 Nov 25 2014 12:38:51 %S A141250 11,17,23,37,41,97,101,121,137,157,191,211,223,227,331,347,431,443,457 %N A141250 Prime powers related to minimal visibility in the square n X n lattice. %C A141250 So far 121 is the only composite here. The numbers in A141249 greater than 1 are 2*a(n)-1. %Y A141250 Cf. A141246. %K A141250 nonn %O A141250 1,1 %A A141250 _T. D. Noe_, Jun 17 2008