%I #12 May 21 2023 12:21:39

%S 23,29,53,71,77,83,91,92,94,103,109,113,116,118,121,151,157,181,197,

%T 209,212,214,217,229,263,269,275,283,284,286,295,301,305,308,310,313,

%U 323,331,332,334,355,363,364,366,368,370,376,378

%N Numbers whose base-4 representation contains exactly two 1's and one 3.

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_