40
20,2
10,2,2
5,2,2,2
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23 is already prime; it doesn't need a tree.
40, 80, 120, 160, 200, 240, 280, 320, 360, 400 . . .
The Least Common Multiple (LCM) for 40 24 is 120.
Least Common Multiple (LCM) for 40 4 is 40.
Factors of 15 are: 1 3 5 and 15 of which 3 and 5 are prime factors