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 A259081 #8 Jun 18 2015 18:45:37 %S A259081 68,43,59,84,106,91,104,101,100,56 %N A259081 a(n) = largest k such that the decimal representation of 3^k does not contain the digit n. %C A259081 These values are only conjectural. %H A259081 Popular Computing (Calabasas, CA), <a href="/A094776/a094776.jpg">Two Tables</a>, Vol. 1, (No. 9, Dec 1973), page PC9-16. %Y A259081 Cf. A094776, A259081. A259083. %K A259081 nonn,fini,full,base %O A259081 0,1 %A A259081 _N. J. A. Sloane_, Jun 18 2015