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MathNet 2023-part-06 — 191 problems (EN–VI) Question 143

Math Olympiad Vault · MathNet 2023-part-06 — 191 problems (EN–VI)

Question 143

For each integer $n \gt 1$, let $f(n)$ be the greatest proper divisor of $n$. Is there a positive integer $k$ for which the total number of integers $n$ satisfying
$$
n - f(n) = k
$$
is equal to 2023?