468
234,2
117,2,2
39,3,2,2
13,3,3,2,2
29 is prime. No tree.
31 is prime. No tree.
43 is prime. No tree.
12
22 2,11
82 2,41
22 2,11
38 2,19
Factor tree for 51: 51 * 1 or 17 * 3 Factor tree for 255: 255 * 1 or 51 * 5
13 is already prime. It doesn't need a tree.
45 15,3 5,3,3
92 46,2 23,2,2