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 A259083 #6 Jun 18 2015 18:46:15 %S A259083 35,30,28,20,29,25,33,39,33,61 %N A259083 a(n) = largest k such that the decimal representation of 7^k does not contain the digit n. %C A259083 These values are only conjectural. %H A259083 Popular Computing (Calabasas, CA), <a href="/A094776/a094776.jpg">Two Tables</a>, Vol. 1, (No. 9, Dec 1973), page PC9-16. %Y A259083 Cf. A094776, A259081, A259082. %K A259083 nonn,fini,full,base %O A259083 0,1 %A A259083 _N. J. A. Sloane_, Jun 18 2015