A033069 Numbers with the property that all pairs of consecutive base-4 digits differ by 1.

1, 2, 3, 4, 6, 9, 11, 14, 17, 25, 27, 36, 38, 46, 57, 59, 68, 70, 100, 102, 110, 145, 153, 155, 185, 187, 228, 230, 238, 273, 281, 283, 401, 409, 411, 441, 443, 580, 582, 612, 614, 622, 740, 742, 750, 913, 921, 923, 953, 955, 1092

Offset

1,2

Links

Table of n, a(n) for n=1..51.

Mathematica

Join[Range[3], Select[Range[2000], Union[Abs[Differences[IntegerDigits[#, 3]]]]=={1}&]] (* Harvey P. Dale, Dec 28 2011 *)

Crossrefs

Sequence in context: A018431 A184350 A347657 * A368481 A022956 A331444

Adjacent sequences: A033066 A033067 A033068 * A033070 A033071 A033072

Keyword

nonn,base

Author

Clark Kimberling

Status

approved