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Erdős problem 347

Is there a sequence A={a1a2}A=\{a_1\leq a_2\leq \cdots\} of integers with liman+1an=2\lim \frac{a_{n+1}}{a_n}=2 such that P(A)={nBn:BA finite }P(A')= \left\{\sum_{n\in B}n : B\subseteq A'\textrm{ finite }\right\} has density 11 for every cofinite subsequence AA' of AA?
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Accepted in Vela Mathematics Program

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