A033007 Every run of digits of n in base 9 has length 2.

10, 20, 30, 40, 50, 60, 70, 80, 810, 830, 840, 850, 860, 870, 880, 890, 1620, 1630, 1650, 1660, 1670, 1680, 1690, 1700, 2430, 2440, 2450, 2470, 2480, 2490, 2500, 2510, 3240, 3250, 3260, 3270, 3290, 3300, 3310, 3320, 4050

Offset

1,1

Comments

See A043291 and A033001 through A033014 for the analog in other bases, A033015 - A033029 for the variants with run lengths >= 2. - M. F. Hasler, Feb 02 2014

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Formula

a(n) = 10*A043313(n) (= 10*n for n<9). - M. F. Hasler, Feb 02 2014

Mathematica

Select[Range[10000], Union[Length/@Split[IntegerDigits[#, 9]]]=={2}&] (* Vincenzo Librandi, Feb 05 2014 *)

Crossrefs

Sequence in context: A031497 A020337 A044835 * A127993 A135557 A093037

Adjacent sequences: A033004 A033005 A033006 * A033008 A033009 A033010

Keyword

nonn,base

Author

Clark Kimberling

Status

approved