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 A287519 #8 Mar 11 2025 04:41:52
%S A287519 2,3,4,5,6,7,8,10,11,12,13,14,15,17,18,19,20,21,22,24,25,26,28,29,30,
%T A287519 31,32,33,34,36,37,38,39,40,41,43,44,45,47,48,49,51,52,53,54,55,56,58,
%U A287519 59,60,61,62,63,65,66,67,69,70,71,73,74,75,76,77,78,80
%N A287519 Positions of 0 in A287457; complement of A287186.
%C A287519 Conjecture: a(n)/n -> 1.20..., and if m denotes this number, then -1 < m - a(n)/n < 1 for n >= 1.
%H A287519 Clark Kimberling, <a href="/A287519/b287519.txt">Table of n, a(n) for n = 1..10000</a>
%t A287519 s = {0, 0}; w[0] = StringJoin[Map[ToString, s]];
%t A287519 w[n_] := StringReplace[w[n - 1], {"00" -> "1000", "10" -> "000"}]
%t A287519 Table[w[n], {n, 0, 8}]
%t A287519 st = ToCharacterCode[w[23]] - 48 (* A287457 *)
%t A287519 Flatten[Position[st, 0]] (* A287519 *)
%t A287519 Flatten[Position[st, 1]] (* A287186 *)
%Y A287519 Cf. A287457, A287186.
%K A287519 nonn,easy
%O A287519 1,1
%A A287519 _Clark Kimberling_, Jun 17 2017