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 A173801 #3 Mar 30 2012 17:22:55 %S A173801 1,1,1,2,1,3,1,4,2,3,1,9,1,3,3,9,1,14,1,12,3,3,1,28,2,3,5,9,1,32,1,17, %T A173801 3,3,3,50,1,3,5,31,1,32,1,9,14,4,1,97,2,10,3,9,1,57,4,27,3,4,1,160,1, %U A173801 3,9,34,3,32,1,9,3,23,1,193,1,3,10,9,3,51,1,102,9,3,1,148,3,3,3,28,1,255,3 %N A173801 The number of primitive numbers k such that 1/k is in the Cantor set and the fraction 1/k has period n. %C A173801 See A173800 for the numbers k for each n. %H A173801 T. D. Noe, <a href="/A173801/b173801.txt">Table of n, a(n) for n=1..200</a> %K A173801 nonn %O A173801 1,4 %A A173801 _T. D. Noe_, Feb 25 2010