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 A039215 #14 Sep 08 2022 08:44:53
%S A039215 1,2,3,4,5,7,8,9,10,11,13,14,15,16,17,19,20,21,22,23,25,26,27,28,29,
%T A039215 31,32,33,34,35,37,38,39,40,41,43,44,45,46,47,49,50,51,52,53,55,56,57,
%U A039215 58,59,61,62,63,64,65,67,68,69,70,71,72,85,86,87,88,89,91,92,93,94
%N A039215 Numbers whose base-12 representation has the same number of 0's and 6's.
%t A039215 Select[Range[200], DigitCount[#, 12, 6] == DigitCount[#, 12, 0]&] (* _Vincenzo Librandi_, Oct 26 2016 *)
%o A039215 (Magma) [n: n in [1..120] | Multiplicity(S, 0) eq Multiplicity(S, 6) where S is {*d: d in Intseq(n, 12)*}]; // _Vincenzo Librandi_, Oct 26 2016
%K A039215 nonn,base,easy
%O A039215 1,2
%A A039215 _Olivier Gérard_