800
400,2
200,2,2
100,2,2,2
50,2,2,2,2
25,2,2,2,2,2
5,5,2,2,2,2,2
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1600
it first breaks down to...
40, 40
then...
2,2,20,20
then
2,2,2,2,10,10
then
2,2,2,2,2,2,5, and 5
83 is prime. No tree.
61 is already prime. It doesn't need a tree.
When the bottom branch consists entirely of prime numbers.
200
145 5,29 Not much of a tree. More like a factor shrub.