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%I #13 May 16 2023 22:05:27
%S 90,102,105,150,153,165,282,294,297,330,354,360,363,366,378,390,393,
%T 402,408,411,414,417,420,423,429,438,441,474,486,489,534,537,549,582,
%U 585,594,600,603,606,609,612,615,621,630,633,645
%N Numbers whose base-4 representation contains exactly two 1's and two 2's.
%t Select[Range[700],DigitCount[#,4,1]==DigitCount[#,4,2]==2&] (* _Harvey P. Dale_, Dec 04 2011 *)
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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