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 A083923 #11 Jan 30 2024 08:23:31 %S A083923 0,1,0,1,0,0,0,1,1,0,0,0,0,0,0,0,0,1,1,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0, %T A083923 0,0,0,0,0,0,0,0,0,0,0,1,1,0,1,1,1,0,0,0,1,1,0,1,1,1,0,1,1,1,1,0,0,0, %U A083923 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A083923 Characteristic function for A057548. %H A083923 <a href="/index/Ch#char_fns">Index entries for characteristic functions</a> %F A083923 a(n) = 1 if A057515(n)=1 (equivalently: if A072772(n)=0), otherwise 0. %Y A083923 a(n) = A083924(A069770(n)). Used to compute A083925. %K A083923 nonn %O A083923 0,1 %A A083923 _Antti Karttunen_, May 13 2003