%I #4 Oct 12 2013 15:29:00
%S 1,2,3,5,5,6,7,7,7,7,11,7,13,7,7,7,17,7,19,7,11,7,23,7,11,7,7,7,29,11,
%T 31,11,7,7,13,11,37,7,17,7,41,13,43,7,7,7,47,7,7,13,11,7,53,7,17,7,23,
%U 11,59,13,61,7,7,13,19,17,67,7,7,7,71,13,73,7,7,7,19,19,79,7
%N Start with n; if prime, stop; repeatedly sum prime factors (counted with multiplicity) and add 1, until reach 1, 6 or a prime.
%e 20 -> 2+2+5+1 = 10 -> 2+5+1 = 8 -> 2+2+2+1 = 7 so a(20)=7.
%K nonn
%O 1,2
%A _Dann Toliver_