OFFSET
1,10
COMMENTS
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
EXAMPLE
14! in base-10: 2,7,0,0,1,7,3,0,1,3,0,0; ten runs, of which 6 are distinct, so that a(14!) = 6.
MATHEMATICA
b = 10; 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