%I
%S 1,2,1,2,3,2,2,4,1,3,2,3,2,2,2,2,3,3,1,5,4,4,4,7,1,4,2,5,3,3,3,3,3,6,
%T 4,5,3,2,3,5
%N Number of distinct prime divisors of 44...447 (with n 4s).
%C Also number of distinct prime factors of (10^(n + 1)  1)*4/9 + 3.  _Stefan Steinerberger_, Feb 21 2006
%e Number of distinct prime divisors of 47 is 1 (prime).
%e Number of distinct prime divisors of 447 is 2.
%e Number of distinct prime divisors of 4447 is 1 (prime).
%t Table[Length[FactorInteger[(10^(n + 1)  1)*4/9 + 3]], {n, 1, 40}] (* _Stefan Steinerberger_, Feb 21 2006 *)
%Y Cf. A104564.
%K nonn
%O 0,2
%A _Parthasarathy Nambi_, Apr 24 2005
%E More terms from _Stefan Steinerberger_, Feb 21 2006
