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Numbers whose base-12 representation has the same number of 4's and 9's.
1

%I #12 Jun 26 2021 20:29:46

%S 0,1,2,3,5,6,7,8,10,11,12,13,14,15,17,18,19,20,22,23,24,25,26,27,29,

%T 30,31,32,34,35,36,37,38,39,41,42,43,44,46,47,57,60,61,62,63,65,66,67,

%U 68,70,71,72,73,74,75,77,78,79,80,82,83,84,85,86,87,89,90,91,92,94

%N Numbers whose base-12 representation has the same number of 4's and 9's.

%t Select[Range[0,100],DigitCount[#,12,4]==DigitCount[#,12,9]&] (* _Harvey P. Dale_, Jun 06 2016 *)

%K nonn,base,easy

%O 1,3

%A _Olivier GĂ©rard_