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MathNet 2024-part-04 — 168 problems (EN–VI) Question 32

Math Olympiad Vault · MathNet 2024-part-04 — 168 problems (EN–VI)

Question 32

For a positive integer $n$, we define $\alpha(n)$ as the average of all positive divisors of $n$, and $\beta(n)$ as the average of all positive integers $k \le n$ such that $\gcd(k, n) = 1$.
Find all positive integers $n$ for which $\alpha(n) = \beta(n)$.