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 A353579 #12 Jul 09 2022 21:46:59 %S A353579 1,2,4,7,8,13,14,15,16,26,28,29,30,31,32,52,55,56,58,60,61,62,63,64, %T A353579 103,104,109,110,111,112,116,119,120,122,124,125,126,127,128,205,206, %U A353579 207,208,218,220,221,222,223,224,231,232,237,238,239,240,244,247,248,250,252,253,254,255,256 %N A353579 Numbers in the smallest subset of N containing 1 and closed under the mappings k->2^n + k, k->3*2^{n+1} + k, and k->3*2^{n+2} + k where n = ceiling(log_2(k)). %H A353579 Paul K. Stockmeyer, <a href="/A353579/b353579.txt">Table of n, a(n) for n = 1..1155</a> %H A353579 Andreas M. Hinz and Paul K. Stockmeyer, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL25/Hinz/hinz5.html">Precious Metal Sequences and Sierpinski-Type Graphs</a>, J. Integer Seq., Vol 25 (2022), Article 22.4.8. %K A353579 nonn %O A353579 1,2 %A A353579 _Paul K. Stockmeyer_, May 03 2022