Erdős problem 424 · problems.science

Let $a_1 = 2$ and $a_2 = 3$ and continue the sequence by appending to $a_1, \dots, a_n$ all possible values of $a_ia_j - 1$ with $i \ne j$ . Is it true that the set of integers which eventually appear has positive density?

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Let $a_1 = 2$ and $a_2 = 3$ and continue the sequence by appending to $a_1, \dots, a_n$ all possible values of $a_ia_j - 1$ with $i \ne j$. Is it true that the set of integers which eventually appear has positive density?

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