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Erdős problem 950

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This function was considered by de Bruijn, Erdős, and Turán, who showed that ∑n<xf(n)∼∑n<xf(n)2∼x\sum_{n<x}f(n)\sim \sum_{n<x}f(n)^2\sim x. They gave no proofs, but a proof of the (harder) second claim is given by Gorodetsky here [mathoverflow/508491].

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