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A045131 Numbers whose base-4 representation contains exactly four 1's and two 3's. 0
1375, 1399, 1405, 1495, 1501, 1525, 1879, 1885, 1909, 2005, 3415, 3421, 3445, 3541, 3925, 4447, 4471, 4477, 4567, 4573, 4597, 4951, 4957, 4981, 5077, 5215, 5239, 5245, 5335, 5341, 5365, 5407, 5431, 5437, 5455, 5487 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
CROSSREFS
Cf. A007090.
Sequence in context: A239974 A258964 A349235 * A365868 A056049 A206340
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified April 14 00:20 EDT 2024. Contains 371652 sequences. (Running on oeis4.)