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Numbers whose base-12 representation has the same number of 5's and 10's.
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%I #11 Jun 27 2021 10:38:27

%S 0,1,2,3,4,6,7,8,9,11,12,13,14,15,16,18,19,20,21,23,24,25,26,27,28,30,

%T 31,32,33,35,36,37,38,39,40,42,43,44,45,47,48,49,50,51,52,54,55,56,57,

%U 59,70,72,73,74,75,76,78,79,80,81,83,84,85,86,87,88,90,91,92,93

%N Numbers whose base-12 representation has the same number of 5's and 10's.

%t Select[Range[0,100],DigitCount[#,12,5]==DigitCount[#,12,10]&] (* _Harvey P. Dale_, Jun 27 2018 *)

%K nonn,base,easy

%O 1,3

%A _Olivier GĂ©rard_