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並前往https://www.maa.org/sites/default/files/pdf/Putnam/2020/2020%20Putnam%20Session%20B%20Solutions.pdf

B1. For a positive integer n, define d(n) as the sum of the digits ...

Determine S modulo 2020. Answer. 1990. Solution 1. We will show that if we let d(0) = 0, start the sum at k = 0 (which does not change its value), ...

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