40
20,2
10,2,2
5,2,2,2
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40 20,2 10,2,2 5,2,2,2
83 is prime. No tree.
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
61 is already prime. It doesn't need a tree.
it is 40 because it is the greatest common factor for the numbers10 and 40