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A045127 Numbers whose base-4 representation contains exactly three 1's and three 3's. 1
1407, 1503, 1527, 1533, 1887, 1911, 1917, 2007, 2013, 2037, 3423, 3447, 3453, 3543, 3549, 3573, 3927, 3933, 3957, 4053, 4479, 4575, 4599, 4605, 4959, 4983, 4989, 5079, 5085, 5109, 5247, 5343, 5367, 5373, 5439, 5567 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[6000], DigitCount[#, 4, 1]==DigitCount[#, 4, 3]==3&] (* Harvey P. Dale, Nov 26 2023 *)
CROSSREFS
Cf. A007090.
Sequence in context: A107522 A158764 A035863 * A210786 A187957 A235906
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified April 15 04:52 EDT 2024. Contains 371667 sequences. (Running on oeis4.)