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 A091252 #7 Mar 31 2012 14:02:20 %S A091252 2,31,73,87,117,283,313,319,375,379,395,415,419,433,445,471,477,499, %T A091252 505,515,535,587,613,665,769,841,929 %N A091252 Nonprimitive irreducible polynomials over GF(2). %H A091252 A. Karttunen, <a href="/A091247/a091247.scm.txt">Scheme-program for computing this sequence.</a> %H A091252 <a href="/index/Ge#GF2X">Index entries for sequences operating on GF(2)[X]-polynomials</a> %Y A091252 a(n) = A014580(A091251(n)). Cf. A091250. In binary format: A091253. %K A091252 nonn %O A091252 1,1 %A A091252 _Antti Karttunen_, Jan 03 2004