Find all numbers $n$ so that there exists $n$ integers $a_1, a_2, ..., a_n$: $a_i \ge 2$ and $a_i\cdot a_j +1 (\forall i\not = j)$ are all perfect squares.
2025-01-13 02:26:44.1736735204
$n$ integers, $a_i a_j +1$ all perfect squares
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