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 A270042 #13 Mar 10 2016 20:55:28
%S A270042 14,15,16,17,18,19,21,21,23,23,25,25,29,29,29,29,31,31,35,35,35,35,37,
%T A270042 37,228,228,232,271,271,271,271,271,273,343,343,343,343,343,343,343,
%U A270042 343,343,343,451,451,451,451,451,451,451,451,451,451,451,451,451,451,451,455,472,472,599
%N A270042 a(n) = Smallest m >= 13 containing no sixes when represented in any base from 7 through n.
%C A270042 It remains to be determined if the sequence is finite.
%H A270042 Nathan Fox, <a href="/A270042/b270042.txt">Table of n, a(n) for n = 7..159</a>
%t A270042 Table[SelectFirst[Range[13, 10^3], Total@ Map[Function[k, DigitCount[#, k, 6]], Range[7, n]] == 0 &], {n, 7, 68}] /. n_ /; MissingQ@ n -> Nothing (* _Michael De Vlieger_, Mar 10 2016, Version 10.2 *)
%Y A270042 Cf. A270032, A270037, A270038, A216192, A270039, A270040, A270041, A270043, A270044, A270045.
%K A270042 nonn,base
%O A270042 7,1
%A A270042 _Nathan Fox_, Mar 09 2016