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 A091253 #8 Mar 31 2012 14:02:20 %S A091253 10,11111,1001001,1010111,1110101,100011011,100111001,100111111, %T A091253 101110111,101111011,110001011,110011111,110100011,110110001, %U A091253 110111101,111010111,111011101,111110011,111111001,1000000011 %N A091253 Nonprimitive irreducible polynomials over GF(2) in binary format. %H A091253 A. Karttunen, <a href="/A091247/a091247.scm.txt">Scheme-program for computing this sequence.</a> %H A091253 <a href="/index/Ge#GF2X">Index entries for sequences operating on GF(2)[X]-polynomials</a> %Y A091253 a(n) = A007088(A091252(n)). %K A091253 nonn %O A091253 1,1 %A A091253 _Antti Karttunen_, Jan 03 2004