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Numbers having two 3's in base 6.
1

%I #15 Jan 10 2025 10:15:04

%S 21,57,93,111,117,123,126,127,128,130,131,135,141,165,201,237,273,309,

%T 327,333,339,342,343,344,346,347,351,357,381,417,453,489,525,543,549,

%U 555,558,559,560,562,563,567,573,597,633,651

%N Numbers having two 3's in base 6.

%H Harvey P. Dale, <a href="/A043382/b043382.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[700],DigitCount[#,6,3]==2&] (* _Harvey P. Dale_, Jan 10 2025 *)

%Y Cf. A007092.

%K nonn,base

%O 1,1

%A _Clark Kimberling_