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 A060139 #17 Jan 05 2025 19:51:36 %S A060139 0,1,2,5,9,14,18,26,41,45,53,77,81,122,126,134,158,162,230,234,242, %T A060139 365,369,377,401,405,473,477,485,689,693,701,725,729,1094,1098,1106, %U A060139 1130,1134,1202,1206,1214,1418,1422,1430,1454,1458,2066,2070,2078,2102,2106 %N A060139 Ordered set S defined by these rules: 0 and 1 are in S and if x is a nonzero number in S, then 3x-1 and 9x are in S. %C A060139 The numbers 1 and 9x occupy same positions in S that 1 occupies in the infinite Fibonacci word (A003849). %H A060139 Ivan Neretin, <a href="/A060139/b060139.txt">Table of n, a(n) for n = 0..10000</a> %H A060139 Clark Kimberling, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL3/goldentext.html">A Self-Generating Set and the Golden Mean</a>, J. Integer Sequences, 3 (2000), #00.2.8. %H A060139 Clark Kimberling, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Papers1/52-3/Kimberling11132013.pdf">Fusion, Fission, and Factors</a>, Fib. Q., 52 (2014), 195-202. %Y A060139 Cf. A060138, A060142. %K A060139 nonn %O A060139 0,3 %A A060139 _Clark Kimberling_, Mar 05 2001