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 A039268 #19 Sep 08 2022 08:44:53
%S A039268 0,1,2,3,4,5,6,8,9,10,12,13,14,15,16,17,18,20,21,22,24,25,26,27,28,29,
%T A039268 30,32,33,34,36,37,38,39,40,41,42,44,45,46,48,49,50,51,52,53,54,56,57,
%U A039268 58,60,61,62,63,64,65,66,68,69,70,72,73,74,75,76,77,78,80
%N A039268 Numbers whose base-12 representation has the same number of 7's and 11's.
%H A039268 Vincenzo Librandi, <a href="/A039268/b039268.txt">Table of n, a(n) for n = 1..1000</a>
%t A039268 Select[Range[0, 100], DigitCount[#, 12, 7] == DigitCount[#, 12, 11] &] (* _Vincenzo Librandi_, Oct 20 2012 *)
%o A039268 (Magma) [n: n in [0..100] | Multiplicity(S,7) eq Multiplicity(S,11) where S is {*d: d in Intseq(n,12)*}]; // _Bruno Berselli_, Oct 20 2012
%K A039268 nonn,base,easy
%O A039268 1,3
%A A039268 _Olivier Gérard_
%E A039268 An incorrect g.f. was deleted by _N. J. A. Sloane_, Sep 13 2009