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 A060141 #17 Jan 05 2025 19:51:36 %S A060141 0,1,3,9,11,27,29,33,81,83,87,99,101,243,245,249,261,263,297,299,303, %T A060141 729,731,735,747,749,783,785,789,891,893,897,909,911,2187,2189,2193, %U A060141 2205,2207,2241,2243,2247,2349,2351,2355,2367,2369,2673,2675,2679,2691 %N A060141 Ordered set S defined by these rules: 0 and 1 are in S and if x is a nonzero number in S, then 3x and 9x+2 are in S. %C A060141 The numbers of the form 9x+1 occupy the same positions in S that 1 occupies in the infinite Fibonacci word (A003849). %H A060141 Ivan Neretin, <a href="/A060141/b060141.txt">Table of n, a(n) for n = 0..10000</a> %H A060141 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 A060141 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 A060141 Cf. A060138, A060139, A060140, A060142. %K A060141 nonn %O A060141 0,3 %A A060141 _Clark Kimberling_, Mar 05 2001