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A033008 Every run of digits of n in base 10 has length 2. 4
11, 22, 33, 44, 55, 66, 77, 88, 99, 1100, 1122, 1133, 1144, 1155, 1166, 1177, 1188, 1199, 2200, 2211, 2233, 2244, 2255, 2266, 2277, 2288, 2299, 3300, 3311, 3322, 3344, 3355, 3366, 3377, 3388, 3399, 4400, 4411, 4422, 4433 (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..800

FORMULA

a(n) = 11*A043314(n) (= 11*n for n<10). - M. F. Hasler, Feb 02 2014

MATHEMATICA

Select[Range[10000], Union[Length/@Split[IntegerDigits[#, 10]]]=={2}&] (* Vincenzo Librandi, Feb 05 2014 *)

CROSSREFS

Sequence in context: A321536 A110732 A044836 * A082275 A059544 A070022

Adjacent sequences:  A033005 A033006 A033007 * A033009 A033010 A033011

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 18 20:02 EDT 2019. Contains 326109 sequences. (Running on oeis4.)