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 A269724 #35 Mar 09 2016 04:09:19
%S A269724 0,1,3,4,31,58130496,58130499,58130500,58130703,58183951,
%T A269724 77810815551163745898450783,77810815551163745898451143,
%U A269724 61819635578801174196008456415,61819635578801174196008574451,61819635578801174196008574771
%N A269724 Numbers which contain no 2's when written in bases 3 through 10.
%C A269724 There are 134 known terms. If a(135) exists, it must exceed 10^2300.
%H A269724 Nathan Fox, <a href="/A269724/b269724.txt">Table of n, a(n) for n = 1..134</a>
%o A269724 (PARI) isok(n) = {for (b=3, 10, d = digits(n, b); if (vecsearch(vecsort(d,,8),2), return (0));); 1;} \\ _Michel Marcus_, Mar 06 2016
%Y A269724 Cf. A216192, A216194.
%K A269724 nonn,base
%O A269724 1,3
%A A269724 _Nathan Fox_, Mar 03 2016