olymmath

APMO 2017 Problem 1

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We call a 5-tuple of integers arrangeable if its elements can be labeled aa, b,c,d,eb, c, d, e in some order so that a−b+c−d+e=29a-b+c-d+e=29. Determine all 2017-tuples of integers n1,n2,…,n2017n_{1}, n_{2}, \ldots, n_{2017} such that if we place them in a circle in clockwise order, then any 5 -tuple of numbers in consecutive positions on the circle is arrangeable.

Dataset text NuminaMath olympiads. Quoted with source.

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n_{1}=\cdots=n_{2017}=29

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