%I
%S 50,70,171,191,292,312,413,433,490,501,512,523,545,550,551,552,553,
%T 555,557,558,559,560,567,578,589,600,655,675,730,741,752,763,770,771,
%U 772,773,775,777,778,779,780,785,807,818,829,840,897,917,1018,1038
%N Numbers whose base11 representation has the same nonzero number of 4's and 6's.
%t okQ[n_]:=Module[{dc4=DigitCount[n,11,4]},dc4>0&&dc4==DigitCount[n,11,6]]
%t Select[Range[1100],okQ] (* _Harvey P. Dale_, Jan 09 2011 *)
%K nonn,base,easy
%O 1,1
%A _Olivier GĂ©rard_
