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MathNet 2017-part-07 — 172 problems (EN–VI) Question 84

Math Olympiad Vault · MathNet 2017-part-07 — 172 problems (EN–VI)

Question 84

Each of the positive integers $a_{1}, a_{2}, \ldots, a_{n}$ is less than $2016$, and the least common multiple of any two is greater than $2016$. Show that
$$
\frac{1}{a_{1}}+\cdots+\frac{1}{a_{n}}\lt 1+\frac{n}{2016}.
$$