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%I #12 May 21 2023 12:23:00
%S 63,127,207,223,243,247,252,253,319,383,463,479,499,503,508,509,783,
%T 799,819,823,828,829,847,863,883,887,892,893,963,967,972,973,979,983,
%U 988,989,1008,1009,1012,1013,1087,1151,1231,1247
%N Numbers whose base-4 representation contains no 2's and exactly three 3's.
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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