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More fun in 2015, Part 17

Number Theory Level 5

How many integers \(a\) with \(1\leq{a}\leq2015\) are there such that 2015 divides \(a^{30}-1\)?

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Excel in math and science

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It's hard to learn from lectures and videos

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including olympiad champions, researchers, and professionals.

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by Otto Bretscher

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