Question 27
Find all positive integers $n\gt 2$ such that
$$
n!\mid \prod_{\substack{p\lt q \leqslant n, p, q \text { primes }}}(p+q) .
$$
$$
n!\mid \prod_{\substack{p\lt q \leqslant n, p, q \text { primes }}}(p+q) .
$$
IMO Shortlist · IMO 2022 — Complete Shortlist