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The remainder when a base-16 number is divided by d is always the same as the remainder when the sum of the digits of the base-16 number is divided by d. What is the sum of all possible positive integer values of d? (d is base 10.) The answer should be base 10.

 Oct 19, 2022
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The possible values of d are 1, 2, 3, 5, 10, so the answer is 1 + 2 + 3 + 5 + 10 = 21.

 Oct 19, 2022

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