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 A035058 #27 Sep 08 2022 08:44:52
%S A035058 0,1,2,3,4,6,7,8,9,10,11,12,13,18,19,20,21,24,26,32,34,38,40,44,48,50,
%T A035058 53,57,60,80,91,92,102,153
%N A035058 Numbers k such that 2^k does not contain the digit 3 (probably finite).
%C A035058 No more terms <= 10^4. - _Georg Fischer_, Mar 12 2020
%C A035058 Next term > 2*10^5. - _Tyler NeSmith_, Jul 30 2021
%t A035058 Join[{0}, Select[Range@10000, FreeQ[IntegerDigits[2^#], 3] &]] (* _Vincenzo Librandi_, May 07 2015 *)
%o A035058 (Magma) [n: n in [0..1000] | not 3 in Intseq(2^n) ]; // _Vincenzo Librandi_, May 07 2015
%o A035058 (PARI) isok(n) = ! vecsearch(Set(digits(2^n)), 3); \\ _Michel Marcus_, Feb 09 2018
%Y A035058 Cf. similar sequences listed in A035064.
%K A035058 nonn,base
%O A035058 1,3
%A A035058 _Patrick De Geest_, Nov 15 1998
%E A035058 Initial 0 added by _Vincenzo Librandi_, May 07 2015
%E A035058 Removed keyword "fini" as in A035064, since it is only a conjecture that this sequence contains only finitely many terms. - _Georg Fischer_, Mar 12 2020