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A033069
Numbers with the property that all pairs of consecutive base-4 digits differ by 1.
0
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
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
KEYWORD
nonn,base
STATUS
approved