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 A096688 #3 Mar 30 2012 17:29:16 %S A096688 9,45,3,225,18,15,1287,1125,1,9,9,75,693,6435,6,5625,5877,5,5211,45, %T A096688 429,45,43083,375,36,3465,37,32175,341721,3,32229,28125,3,29385,2574, %U A096688 25,27,26055,231,225,2439,2145,230463,225,2,215415,1917,1875,202041,18,1959 %N A096688 Least k such that decimal representation of k*n contains only digits 0 and 9. %F A096688 a(n) = A078248(n)/n. %Y A096688 Cf. A004290, A078241-A078248, A079339, A096681-A096688. %K A096688 base,nonn %O A096688 1,1 %A A096688 _Ray Chandler_, Jul 12 2004