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Numbers whose base-4 representation contains exactly four 1's and two 3's.
0

%I #12 May 21 2023 12:25:25

%S 1375,1399,1405,1495,1501,1525,1879,1885,1909,2005,3415,3421,3445,

%T 3541,3925,4447,4471,4477,4567,4573,4597,4951,4957,4981,5077,5215,

%U 5239,5245,5335,5341,5365,5407,5431,5437,5455,5487

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

%Y Cf. A007090.

%K nonn,base

%O 1,1

%A _Clark Kimberling_