279
93 x 3
31 x 3 x 3
77 7,11
15 3,5
1,270,2,135
23 is a prime number. No prime factorization. No tree.
13 is already prime. It doesn't need a tree.
188 94,2 47,2,2
39 3,13
275 55,5 11,5,5
75 25,3 5,5,3
2,675 2,5,125 2,5,5,25 2,5,5,5,5
390 195,2 65,3,2 13,5,3,2
150 75,2 25,3,2 5,5,3,2