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Numbers whose base-9 representation has the same nonzero number of 6's and 7's.
0

%I #13 Jun 30 2021 03:42:19

%S 61,69,142,150,223,231,304,312,385,393,466,474,493,502,511,520,529,

%T 538,549,550,551,552,553,554,557,565,573,582,591,600,609,618,621,622,

%U 623,624,625,626,629,645,709,717,790,798,871,879,952,960,1033,1041

%N Numbers whose base-9 representation has the same nonzero number of 6's and 7's.

%t Select[Range[1100],DigitCount[#,9,6]==DigitCount[#,9,7]>0&] (* _Harvey P. Dale_, Feb 23 2015 *)

%Y Cf. A007095.

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_