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390 (another Prime Pages' Curiosity) |
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The prime factorization of 390 (2 x 3 x 5 x 13) exhibits
the smallest digital sum, [2 + 3 + 5 + (1 + 3)] = 14, of
any factorization with four primes with distinct digital
sums (2, 3, 5, and 4).
[Doyle]
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