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 A175175 #2 Mar 30 2012 17:22:56 %S A175175 1,2,2,3,3,6,5,5,6,8,7,12,7,12,11,12,8,17,10,18,19,18,14,25,18,21,23, %T A175175 24,19,31,21,36,28,30,25,32,27,35,24 %N A175175 Number of primitive numbers k such that 1/k is in the Cantor set and 3^n <= k < 3^(n+1). %C A175175 Primitive means that 3 does not divide k. First differences of A173784. The values of k are in A173793. %K A175175 nonn %O A175175 0,2 %A A175175 _T. D. Noe_, Feb 28 2010