1250 breaks down to 250 and 5. 250 breaks down to 25 and 10. 25 breaks down to 5 and 5... 10 breaks down to 5 and 2.
so the branches of your tree should have 5, 5, 5, 5, and 2 on the ends.
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-----1575
-------/ \
----25 63
----/ \ / \
---5 5 7 9
---------/ \
---------3 3
1575 = 5 x 5 x 7 x 3 x 3
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.
145 5,29 Not much of a tree. More like a factor shrub.
The purpose of a factor tree is to divide a number into prime factors. 1 is not a prime number.