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 A096684 #3 Mar 30 2012 17:29:16 %S A096684 5,25,185,125,1,925,715,625,61728395,5,5,4625,385,3575,37,3125,3265, %T A096684 308641975,2895,25,2405,25,23935,23125,2,1925,203909465,17875,189845, %U A096684 185,17905,15625,16835,16325,143,1543209875,15,14475,1295,125,1355 %N A096684 Least k such that decimal representation of k*n contains only digits 0 and 5. %F A096684 a(n) = A078244(n)/n. %Y A096684 Cf. A004290, A078241-A078248, A079339, A096681-A096688. %K A096684 base,nonn %O A096684 1,1 %A A096684 _Ray Chandler_, Jul 12 2004