1, 3, 9, 27, 81
81
27,3
9,3,3
3,3,3,3
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For 13: 13 For 81: 3
Factors of 15 are: 1 3 5 and 15 of which 3 and 5 are prime factors
The Prime Factor of 81 is 3The Prime Factors of 28 are 2, 7
The multiples of 81 are infinite. The factors of 81 are: 1, 3, 9, 27, 81.
23 is already prime; it doesn't need a tree.