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Repunits (Posted on 2019-01-22) Difficulty: 3 of 5
A repunit is an integer consisting entirely of ones, such as 1, 11, 111, etc. Let N be any integer not divisible by 2 or 5. Show that there is an integer M such that the product MN is a repunit.

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  Subject Author Date
SolutionSolutionBrian Smith2019-01-23 12:21:12
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