OFFSET
1,5
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
8^8 in base 5: 1,3,2,4,3,3,3,2,3,3,1; eight runs, of which 6 are distinct, so that a(8^8) = 6.
MATHEMATICA
b = 5; s[n_] := Length[Union[Split[IntegerDigits[n, b]]]]
Table[s[n], {n, 1, 200}]
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Clark Kimberling, Jan 27 2018
STATUS
approved