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 A054591 #25 Jan 05 2025 19:51:36 %S A054591 1,3,4,9,10,12,13,27,28,30,36,39,40,81,82,84,90,91,108,117,120,121, %T A054591 146,182,205,243,244,246,252,270,273,324,328,351,360,363,364,386,438, %U A054591 546,615,656,671,729,730,732,738,756,757,810,819,820,949,972,984 %N A054591 Denominators of rational numbers that belong to the Cantor set. %H A054591 David Radcliffe, <a href="/A054591/b054591.txt">Table of n, a(n) for n = 1..321</a> %H A054591 D. Jordan and R. Schayer, <a href="https://math.psu.edu/mass/sites/default/files/reu2003/6.pdf">Rational points on the Cantor middle thirds set</a>, Penn State, REU 2003. %H A054591 J. Nagy, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Scanned/39-3/nagy.pdf">Rational Points in Cantor Sets</a>, Fibonacci Quarterly 39.3, (2001), 238-241. %H A054591 C. Wall, <a href="http://www.mathstat.dal.ca/FQ/Scanned/28-2/wall.pdf">Terminating Decimals in the Cantor Ternary Set</a>, Fibonacci Quarterly 28.2 (1990), 98-101. %e A054591 10 belongs to the sequence because 1/10 = 0.00220022... (base 3) is in the Cantor set. - _David Radcliffe_, May 02 2015 %Y A054591 Reminiscent of (but different from) A005836. %K A054591 nonn,frac %O A054591 1,2 %A A054591 _Michael J. Hardy_, Apr 14 2000