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Numbers whose base-12 representation has the same nonzero number of 2's and 7's.
0

%I #12 Jun 30 2021 23:59:03

%S 31,86,175,230,295,307,331,343,355,367,372,373,375,376,377,378,380,

%T 381,382,383,391,403,415,427,463,518,607,662,751,806,895,950,1010,

%U 1022,1032,1033,1035,1036,1037,1038,1040,1041,1042,1043,1046,1058

%N Numbers whose base-12 representation has the same nonzero number of 2's and 7's.

%t Select[Range[1200],DigitCount[#,12,2]==DigitCount[#,12,7]>0&] (* _Harvey P. Dale_, Mar 21 2013 *)

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_