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Numbers whose base-3 representation has the same nonzero number of 0's and 1's.
1

%I #17 Jun 28 2021 04:35:42

%S 3,11,15,19,21,28,30,35,36,47,51,59,61,65,69,73,75,86,88,92,96,100,

%T 102,107,110,114,126,136,138,143,144,155,159,166,172,174,179,185,187,

%U 190,192,197,198,209,213,221,223,227,231,235,237,247,253,255,260,266

%N Numbers whose base-3 representation has the same nonzero number of 0's and 1's.

%t Select[Range[300],DigitCount[#,3,1]==DigitCount[#,3,0]>0&] (* _Harvey P. Dale_, Mar 09 2014 *)

%Y Cf. A007089.

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_