A032980 Numbers with the property that all pairs of consecutive base-9 digits differ by 0 or 1.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 19, 20, 21, 29, 30, 31, 39, 40, 41, 49, 50, 51, 59, 60, 61, 69, 70, 71, 79, 80, 81, 82, 90, 91, 92, 100, 101, 102, 171, 172, 173, 181, 182, 183, 191, 192, 193, 262, 263, 264, 272, 273, 274, 282, 283, 284

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Select[Range[300], Max[Abs[Differences[IntegerDigits[#, 9]]]]<2&] (* Harvey P. Dale, Oct 15 2014 *)

Crossrefs

Cf. A007095.

Sequence in context: A289234 A033000 A130573 * A239217 A130571 A275512

Adjacent sequences: A032977 A032978 A032979 * A032981 A032982 A032983

Keyword

nonn,base

Author

Clark Kimberling

Status

approved