OFFSET
1,11
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
11! in base-11: 2,0,5,9,4,0,10,0; eight runs, of which 6 are distinct, so that a(11!) = 6.
MATHEMATICA
b = 11; s[n_] := Length[Union[Split[IntegerDigits[n, b]]]]
Table[s[n], {n, 1, 200}]
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Clark Kimberling, Feb 03 2018
STATUS
approved