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Numbers whose base-9 representation has the same number of 0's and 1's.
0

%I #15 Jun 25 2021 01:43:22

%S 2,3,4,5,6,7,8,9,20,21,22,23,24,25,26,29,30,31,32,33,34,35,38,39,40,

%T 41,42,43,44,47,48,49,50,51,52,53,56,57,58,59,60,61,62,65,66,67,68,69,

%U 70,71,74,75,76,77,78,79,80,83,84,85,86,87,88,89,99,108,117,126,135

%N Numbers whose base-9 representation has the same number of 0's and 1's.

%t Select[Range[150],DigitCount[#,9,0]==DigitCount[#,9,1]&] (* _Harvey P. Dale_, Dec 23 2011 *)

%Y Cf. A007095.

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_