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 A336813 #18 Nov 22 2020 12:23:42
%S A336813 0,1,2,3,4,5,6,7,8,9,10,13,14,15,16,17,18,29,30,31,32,33,34,41,42,53,
%T A336813 54,61,62,63,64,65,66,76,115,125,126,127,128,129,130,172,211,253,254,
%U A336813 255,256,257,258,312,455,509,510,511,512,513,514,696,839,1021
%N A336813 Fixed points of A187769.
%C A336813 If m > 0 belongs to the sequence, then A054429(m) also belongs to the sequence; this accounts for the symmetries visible in the binary plot of the sequence (see Links section).
%C A336813 For any k >= 0 and any e in {-1, 0, +1}, 2^k + e belongs to the sequence.
%H A336813 Rémy Sigrist, <a href="/A336813/b336813.txt">Table of n, a(n) for n = 1..270</a>
%H A336813 Rémy Sigrist, <a href="/A336813/a336813.png">Binary plot of the terms < 2^24</a>
%H A336813 Rémy Sigrist, <a href="/A336813/a336813.gp.txt">PARI program for A336813</a>
%e A336813 A187769(53) = 53, so 53 belongs to the sequence.
%o A336813 (PARI) See Links section.
%Y A336813 Cf. A054429, A187769.
%K A336813 nonn,base
%O A336813 1,3
%A A336813 _Rémy Sigrist_, Nov 21 2020