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A033007 Every run of digits of n in base 9 has length 2. 3
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 25 11:59 EDT 2017. Contains 288710 sequences.