A045025 Numbers whose base-4 representation contains exactly two 0's and two 1's.

65, 68, 80, 262, 263, 265, 269, 274, 275, 280, 284, 289, 292, 305, 308, 322, 323, 328, 332, 352, 368, 385, 388, 400, 449, 452, 464, 517, 529, 532, 577, 580, 592, 773, 785, 788, 833, 836, 848, 1050, 1051, 1054, 1055, 1062, 1063

Offset

1,1

Links

Table of n, a(n) for n=1..45.

Mathematica

Select[Range[1100], DigitCount[#, 4, 0]==DigitCount[#, 4, 1]==2&] (* Harvey P. Dale, May 07 2016 *)

Crossrefs

Cf. A007090.

Sequence in context: A354474 A081647 A257444 * A321502 A095547 A173379

Adjacent sequences: A045022 A045023 A045024 * A045026 A045027 A045028

Keyword

nonn,base

Author

Clark Kimberling

Status

approved