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Summing the product of digits (Posted on 2019-08-23) |
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Let p(n) denote the product of the nonzero digits of n. For example, p(5) = 5, p(37) = 21, and p(604) = 24. Without resorting to a computer, evaluate
p(1) + p(2) + p(3) + ... + p(999999).
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