A297783 Number of distinct runs in base-15 digits of n.

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

Offset: 1

Author

Clark Kimberling, Feb 03 2018

Keywords

• nonn
• base
• easy

Comments

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

Starts to differ from A043542 at n=3391. - R. J. Mathar, Jul 24 2023

Examples

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

Links

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

Crossrefs

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

Programs

Mathematica

b = 15; s[n_] := Length[Union[Split[IntegerDigits[n, b]]]]
Table[s[n], {n, 1, 200}]