1 + 5 + 25 + 41 + 205 + 1025 = 1,302
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2050 1025, 2 205, 5, 2 41, 5, 5, 2
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.