PUMaC 2024 · 数论（B 组） · 第 6 题
PUMaC 2024 — Number Theory (Division B) — Problem 6
题目详情
- Let r ( m ) be the number of positive integers a less than or equal to m where gcd( a, m ) is prime. Find the sum of all positive integers m < 300 such that r ( m ) = φ ( m ), where φ ( m ) denotes the number of positive integers a less than m where gcd( a, m ) = 1.
解析
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Original Explanation
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