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 A085586 #15 Oct 05 2013 02:09:20
%S A085586 0,2,20,200,202,2000,2002,2020,20000,20002,20020,20200,200000,200002,
%T A085586 200020,200200,202000,2000000,2000002,2000020,2000200,2002000,2020000,
%U A085586 20000000,20000002,20000020,20000200,20000202,20002000,20002002,20020000
%N A085586 n, n^2 and n^3 all use only even digits.
%C A085586 Subsequence of A014263 and of A136904. - _Michel Marcus_, Oct 04 2013
%e A085586 202 is a term because 202, 202^2=4008004 and 202^3=8024024008 all use only even digits.
%o A085586 (PARI) evdigs(n) = {if (n==0, return (1)); digs = digits(n); for (i = 1, #digs, if (digs[i] % 2, return (0));); return (1);}
%o A085586 isok(n) = evdigs(n) && evdigs(n^2) && evdigs(n^3); \\ _Michel Marcus_, Oct 04 2013
%Y A085586 Cf. A068690.
%K A085586 nonn,base
%O A085586 1,2
%A A085586 _Zak Seidov_, Jul 06 2003
%E A085586 More terms from _Michel Marcus_ and _Jon E. Schoenfield_, Oct 04 2013