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OLYMPIC-REVENGE 2018 Problem 1

    Let (Fn)n≥1(F_{n})_{n\geq1} the Fibonacci sequence. Find all n∈Nn \in \mathbb{N} such that for every k=0,1,...,Fnk=0,1,...,F_{n} (Fnk)≡(−1)k (mod Fn+1){F_{n}\choose k} \equiv (-1)^{k} \ (mod \ F_{n}+1)

    Dataset text AI-MO AoPS. Quoted with source.

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