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 A091225 #17 Jan 01 2023 12:35:16 %S A091225 0,0,1,1,0,0,0,1,0,0,0,1,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0, %T A091225 0,0,0,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,0,0,1, %U A091225 0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,1,0,0,0 %N A091225 Characteristic function of A014580: 1 if the n-th GF(2)[X] polynomial is irreducible, 0 otherwise. %H A091225 Antti Karttunen, <a href="/A091225/b091225.txt">Table of n, a(n) for n = 0..100000</a> %H A091225 A. Karttunen, <a href="/A091247/a091247.scm.txt">Scheme-program for computing this sequence</a> %H A091225 <a href="/index/Ch#char_fns">Index entries for characteristic functions</a> %H A091225 <a href="/index/Ge#GF2X">Index entries for sequences operating on GF(2)[X]-polynomials</a> %o A091225 (PARI) a(n) = polisirreducible(Pol(binary(n))*Mod(1, 2)); \\ _Michel Marcus_, Nov 11 2017 %Y A091225 a(n) = A010051(A091203(n)) = A010051(A091205(n)). Partial sums give A091226. Cf. A091227. Complementary to A091247. %K A091225 nonn %O A091225 0,1 %A A091225 _Antti Karttunen_, Jan 03 2004 %E A091225 Data section extended up to a(120) by _Antti Karttunen_, Jan 01 2023