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MathNet 2020 — Math Olympiad Vault — Part 04 Question 6

Math Olympiad Vault · MathNet 2020 — Math Olympiad Vault — Part 04

Question 6

For every positive integer $x$, denote by $\kappa(x)$ the number of composite numbers not greater than $x$. Find all positive integers $n$ such that
$$
(\kappa(n))! \cdot \text{lcm}(1,2,\dots,n) \gt (n-1)!
$$