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A033002 Every run of digits of n in base 4 has length 2. 4
5, 10, 15, 80, 90, 95, 160, 165, 175, 240, 245, 250, 1285, 1290, 1295, 1440, 1445, 1455, 1520, 1525, 1530, 2565, 2570, 2575, 2640, 2650, 2655, 2800, 2805, 2810, 3845, 3850, 3855, 3920, 3930, 3935, 4000, 4005, 4015, 20560 (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 04 2014

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..600

FORMULA

a(n) = 5*A043308(n) (= 5*n for n<4). - M. F. Hasler, Feb 04 2014

MATHEMATICA

Select[Range[10000], Union[Length/@Split[IntegerDigits[#, 4]]]=={2}&] (* Vincenzo Librandi, Feb 05 2014 *)

CROSSREFS

Sequence in context: A020332 A244025 A044830 * A244021 A037358 A262255

Adjacent sequences:  A032999 A033000 A033001 * A033003 A033004 A033005

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 27 15:06 EDT 2017. Contains 285528 sequences.