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%I #11 May 21 2023 12:27:00
%S 383,479,503,509,863,887,893,983,989,1013,1151,1247,1271,1277,1343,
%T 1471,1487,1519,1523,1531,1532,1534,1663,1759,1783,1789,1823,1847,
%U 1853,1871,1903,1907,1915,1916,1918,1951,1975,1981
%N Numbers whose base-4 representation contains exactly two 1's and three 3's.
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_