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APMO 2023 Problem 2

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Find all integers nn satisfying n≥2n \geq 2 and σ(n)p(n)−1=n\frac{\sigma(n)}{p(n)-1}=n, in which σ(n)\sigma(n) denotes the sum of all positive divisors of nn, and p(n)p(n) denotes the largest prime divisor of nn.

Dataset text NuminaMath olympiads. Quoted with source.

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