The tree for 110 is: 55 & 2. 2 is prime. Then 5 & 11. They are both prime.
110 55,2 11,5,2
1997 is already prime; no tree.
Exponents are not needed but it would be 21 x 51 x 111
It is: 2*5*11 = 110
51 3,17
350=2x5x5x7
33 11,3
a prime factorization tree
50 25,2 5,5,2
97 is already prime; no tree.
131 is already prime. No tree.
2 x 5 x 11 = 110