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A297783 Number of distinct runs in base-15 digits of n. 4
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,15

COMMENTS

Every positive integers occurs infinitely many times.  See A297770 for a guide to related sequences.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000

EXAMPLE

12153600 in base-15: 1,1,0,1,1,0,0; four runs, of which 3 are distinct, so that a(12153600) = 3.

MATHEMATICA

b = 15; s[n_] := Length[Union[Split[IntegerDigits[n, b]]]]

Table[s[n], {n, 1, 200}]

CROSSREFS

Cf. A043567 (number of runs, not necessarily distinct), A297770.

Sequence in context: A297782 A043566 A043541 * A043542 A043567 A297784

Adjacent sequences:  A297780 A297781 A297782 * A297784 A297785 A297786

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling, Feb 03 2018

STATUS

approved

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Last modified April 19 04:19 EDT 2019. Contains 322237 sequences. (Running on oeis4.)