OFFSET
0,4
LINKS
Amiram Eldar, Table of n, a(n) for n = 0..201
FORMULA
EXAMPLE
The number of distinct prime divisors of 83 is 1 (prime).
The number of distinct prime divisors of 883 is 1 (prime).
The number of distinct prime divisors of 8883 is 3.
MATHEMATICA
Table[PrimeNu[FromDigits[PadLeft[{3}, n, 8]]], {n, 100}] (* Harvey P. Dale, Mar 08 2015 *)
PROG
(PARI) a(n) = omega((8*10^(n+1)-53)/9); \\ Michel Marcus, Jan 27 2014
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Apr 28 2005
STATUS
approved