%I #3 Mar 30 2012 18:50:19
%S 19,38,12,40,32,96,448,1664,1152
%N Least numbers with n = digital root = number of prime factors.
%C For 1 <= n <= 9: A010888(a(n)) = A001222(a(n)) = n.
%e a(7)=448 as A001222(448)=7 because of 448=2*2*2*2*2*2*7
%e and A010888(448)=7 because of 4+4+8=16 and 1+6=7.
%Y Cf. A007953.
%K nonn,base,fini,full
%O 1,1
%A _Reinhard Zumkeller_, Feb 19 2002