110
10, 11
2, 5, 11
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When the bottom branch consists entirely of prime numbers.
Since prime numbers only have one prime factor (themselves), factor trees are unnecessary.
Here is a factor tree of 39: 39 3 x 13 Since these are prime numbers, the factor tree is finished. The prime factors of 39 are 3 and 13.
133 7 x 19 Both 7 and 19 are prime numbers, so the factor tree is complete.
22 2 x 11 Both 2 and 11 are prime numbers, so the factor tree is finished.