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 A032833 #15 Sep 08 2022 08:44:51
%S A032833 3,4,30,31,39,40,273,274,282,283,354,355,363,364,2460,2461,2469,2470,
%T A032833 2541,2542,2550,2551,3189,3190,3198,3199,3270,3271,3279,3280,22143,
%U A032833 22144,22152,22153,22224,22225,22233,22234,22872,22873
%N A032833 Numbers whose set of base-9 digits is {3,4}.
%H A032833 Vincenzo Librandi, <a href="/A032833/b032833.txt">Table of n, a(n) for n = 1..1000</a>
%H A032833 <a href="/index/Ar#3-automatic">Index entries for 3-automatic sequences</a>.
%t A032833 Flatten[Table[FromDigits[#,9]&/@Tuples[{3,4},n],{n,5}]] (* _Vincenzo Librandi_, May 30 2012 *)
%o A032833 (Magma) [n: n in [1..25000] | Set(IntegerToSequence(n, 9)) subset {3, 4}]; // _Vincenzo Librandi_, May 30 2012
%K A032833 nonn,base,easy
%O A032833 1,1
%A A032833 _Clark Kimberling_