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Numbers whose base-8 representation has the same nonzero number of 0's and 1's.
1

%I #14 Jun 29 2021 02:19:56

%S 8,66,67,68,69,70,71,80,88,96,104,112,120,129,136,193,200,257,264,321,

%T 328,385,392,449,456,513,520,530,531,532,533,534,535,538,539,540,541,

%U 542,543,546,547,548,549,550,551,554,555,556,557,558,559,562,563,564

%N Numbers whose base-8 representation has the same nonzero number of 0's and 1's.

%t Select[Range[600],DigitCount[#,8,0]==DigitCount[#,8,1]>0&] (* _Harvey P. Dale_, Oct 05 2012 *)

%Y Cf. A007093.

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_