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Erdős problem 306

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If a/b∈Q>0a/b \in \mathbb{Q}_{>0} and bb is squarefree, can a/ba/b always be written as a finite sum of reciprocals of distinct products of two distinct primes?

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If $a/b \in \mathbb{Q}_{>0}$ and $b$ is squarefree, can $a/b$ always be written as a finite sum of reciprocals of distinct products of two distinct primes?

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