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 A269177 #8 Feb 16 2025 08:33:30 %S A269177 0,3,6,7,11,12,14,15,19,22,24,27,28,30,31,35,38,44,47,48,51,54,55,56, %T A269177 59,60,62,63,67,70,76,79,88,91,94,95,96,99,102,103,107,108,110,111, %U A269177 112,115,118,119,120,123,124,126,127,131,134,140,143,152,155,158,159,176,179,182,183,187,188,190,191,192,195 %N A269177 Numbers that have a finite predecessor in Wolfram's Rule 124 cellular automaton; numbers n for which A269175(n) > 0. %C A269177 Sequence A269174 sorted into ascending order with duplicates removed. %C A269177 The indexing starts from zero, because a(0) = 0 is a special case in this sequence. (Zero is the only number which is its own predecessor). %H A269177 Antti Karttunen, <a href="/A269177/b269177.txt">Table of n, a(n) for n = 0..8940</a> %H A269177 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ElementaryCellularAutomaton.html">Elementary Cellular Automaton</a> %H A269177 S. Wolfram, <a href="http://wolframscience.com/">A New Kind of Science</a> %H A269177 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a> %H A269177 <a href="https://oeis.org/wiki/Index_to_Elementary_Cellular_Automata">Index to Elementary Cellular Automata</a> %o A269177 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A269177 (define A269177 (NONZERO-POS 0 0 A269175)) %Y A269177 Cf. A269174, A269175. %Y A269177 Cf. A269176 (complement). %Y A269177 Cf. A269178 (a subsequence). %K A269177 nonn %O A269177 0,2 %A A269177 _Antti Karttunen_, Feb 22 2016