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MathNet 2026 — Part 04 Question 190

Math Olympiad Vault · MathNet 2026 — Part 04

Question 190

For any positive integer $n$ define
$$
E(n) = n(n + 1)(2n + 1)(3n + 1) \cdots (10n + 1)
$$
Find the greatest common divisor of $E(1)$, $E(2)$, $E(3)$, \ldots $E(2009)$.