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Numbers whose base-12 representation has the same number of 1's and 3's.
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%I #12 Jun 26 2021 15:48:15

%S 0,2,4,5,6,7,8,9,10,11,15,24,26,28,29,30,31,32,33,34,35,37,48,50,52,

%T 53,54,55,56,57,58,59,60,62,64,65,66,67,68,69,70,71,72,74,76,77,78,79,

%U 80,81,82,83,84,86,88,89,90,91,92,93,94,95,96,98,100,101,102,103,104

%N Numbers whose base-12 representation has the same number of 1's and 3's.

%t Select[Range[0,200],DigitCount[#,12,1]==DigitCount[#,12,3]&] (* _Harvey P. Dale_, Feb 25 2015 *)

%K nonn,base,easy

%O 1,2

%A _Olivier GĂ©rard_