23 is a Prime number. No prime factorization. No tree.
23 is already prime; it doesn't have a tree.
77 7,11
15 3,5
23 is already prime; it doesn't need a tree.
23 is already prime; it doesn't need a tree.
1,270,2,135
23 is a prime number. 1,23
253 11 x 23 Both 11 and 23 are prime numbers, so the factor tree is complete.
13 is already prime. It doesn't need a tree.
275 55,5 11,5,5
188 94,2 47,2,2
75 25,3 5,5,3