%I #13 Aug 25 2024 12:40:05

%S 5,17,20,22,25,37,65,68,70,73,80,82,88,90,97,100,102,105,133,145,148,

%T 150,153,165,257,260,262,265,272,274,280,282,289,292,294,297,320,322,

%U 328,330,352,354,360,362,385,388,390,393,400

%N Numbers whose base-4 representation contains exactly two 1's and no 3's.

%t Select[Range[400],DigitCount[#,4,1]==2&&DigitCount[#,4,3]==0&] (* _Harvey P. Dale_, Aug 25 2024 *)

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_