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 A166946 #7 Aug 26 2022 12:46:07 %S A166946 1,0,1,1,0,1,1,0,1,0,1,1,0,1,0,1,1,0,1,1,0,1,0,1,1,0,1,0,1,1,0,1,1,0, %T A166946 1,0,1,1,0,1,1,0,1,0,1,1,0,1,0,1,1,0,1,1,0,1,0,1,1,0,1,1,0,1,0,1,1,0, %U A166946 1,0,1,1,0,1,1,0,1,0,1,1,0,1,0,1,1,0,1,1,0,1,0,1,1,0,1,1,0,1,0,1,1,0,1,0,1 %N A166946 a(n) = 1 if n is a rounded multiple of phi (1.618033989...), the larger golden ratio value; else a(n) = 0. %C A166946 The characteristic function of A007067. %Y A166946 Cf. A001622, A007067, A003849. %K A166946 nonn %O A166946 0,1 %A A166946 _Casey Mongoven_, Oct 24 2009