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%I #19 Dec 09 2021 19:26:03
%S 9,18,28,29,30,33,36,45,55,56,57,60,63,72,85,86,88,89,91,92,93,96,100,
%T 101,102,105,109,110,111,114,117,126,136,137,138,141,144,153,166,167,
%U 169,170,172,173,174,177,181,182,183,186,190,191
%N Numbers having two 0's in base 3.
%t Select[Range[200],DigitCount[#,3,0]==2&] (* _Harvey P. Dale_, Dec 09 2021 *)
%Y Cf. A007089.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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