A045037 Numbers whose base-4 representation contains exactly four 0's and four 1's.

16405, 16453, 16465, 16468, 16645, 16657, 16660, 16705, 16708, 16720, 17413, 17425, 17428, 17473, 17476, 17488, 17665, 17668, 17680, 17728, 20485, 20497, 20500, 20545, 20548, 20560, 20737, 20740, 20752, 20800

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..4800

Mathematica

Select[Range[20000], DigitCount[#, 4, 0] == 4 && DigitCount[#, 4, 1] == 4 &] (* Vincenzo Librandi, Sep 23 2016 *)

Crossrefs

Cf. A007090.

Sequence in context: A282597 A031673 A168507 * A168633 A122714 A133533

Adjacent sequences: A045034 A045035 A045036 * A045038 A045039 A045040

Keyword

nonn,base

Author

Clark Kimberling

Status

approved