PUMaC 2025 · 数论（A 组） · 第 7 题
PUMaC 2025 — Number Theory (Division A) — Problem 7
题目详情
- For a positive integer n , let rad( n ) denote the product of the unique prime divisors of n , where rad(1) = 1. For example, rad(12) = 2 · 3 = 6. Find the sum of all integers n satisfying X rad( d ) = n. d | n (The sum is over all positive integer divisors d of n .)
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