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 A039274 #11 Nov 21 2021 11:59:25 %S A039274 0,1,2,3,4,5,6,7,8,9,12,13,14,15,16,17,18,19,20,21,24,25,26,27,28,29, %T A039274 30,31,32,33,36,37,38,39,40,41,42,43,44,45,48,49,50,51,52,53,54,55,56, %U A039274 57,60,61,62,63,64,65,66,67,68,69,72,73,74,75,76,77,78,79,80,81 %N A039274 Numbers whose base-12 representation has the same number of 10's and 11's. %t A039274 Select[Range[0,100],DigitCount[#,12,10]==DigitCount[#,12,11]&] (* _Harvey P. Dale_, Nov 21 2021 *) %K A039274 nonn,base,easy %O A039274 1,3 %A A039274 _Olivier Gérard_