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 A259082 #5 Jun 18 2015 13:00:47 %S A259082 58,42,1,23,55,-1,45,53,24,65 %N A259082 a(n) = largest k such that the decimal representation of 5^k does not contain the digit n, or -1 if every power of 5 contains the digit n. %C A259082 These values are only conjectural. %H A259082 Popular Computing (Calabasas, CA), <a href="/A094776/a094776.jpg">Two Tables</a>, Vol. 1, (No. 9, Dec 1973), page PC9-16. %K A259082 sign,fini,full,base %O A259082 0,1 %A A259082 _N. J. A. Sloane_, Jun 18 2015