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Numbers whose base-4 representation contains no 2's and exactly four 3's.
0

%I #11 Apr 23 2023 02:22:41

%S 255,511,831,895,975,991,1011,1015,1020,1021,1279,1535,1855,1919,1999,

%T 2015,2035,2039,2044,2045,3135,3199,3279,3295,3315,3319,3324,3325,

%U 3391,3455,3535,3551,3571,3575,3580,3581,3855,3871

%N Numbers whose base-4 representation contains no 2's and exactly four 3's.

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_