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%I
%S 21,109,153,177,189,201,213,225,237,249,252,254,255,256,257,258,259,
%T 260,262,263,273,285,309,397,453,541,597,685,741,829,885,973,1029,
%U 1117,1173,1261,1297,1308,1310,1311,1312,1313,1314,1315,1316,1318
%N Numbers n such that representation in base 12 has same nonzero number of 1's and 9's.
%K nonn,base,easy
%O 1,1
%A _Olivier Gérard_
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