1, 2, 5, 7, 10, 14, 35, 70
One factor is 3.
13 is already prime. It doesn't need a tree. 13 is prime. No tree.
13 is prime. No tree.
13 is already prime. It doesn't need a tree.
13 is already prime. It doesn't need a tree.
13 is a prime number so it doesn't have a factor tree.
13 is already prime. It doesn't need a tree.
13 is already prime. It doesn't need a tree.
13 is already prime, no tree required.
A factor tree of 78: 78 6 x 13 (2x3) x 13 Since 2, 3, and 13 are prime numbers, the factor tree is complete.
The factor tree of 52 is 52 4 x 13 (2x2) x 13 The factor tree is finished. The prime factorization of 52 is 2 x 2 x 13.