PUMaC 2025 · 数论（B 组） · 第 4 题
PUMaC 2025 — Number Theory (Division B) — Problem 4
题目详情
- How many composite odd integers N ≤ 10 are there such that φ ( N ) is not a multiple of 4? ( φ ( N ) is the number of integers k with 1 ≤ k ≤ N such that gcd( k, N ) = 1.)
解析
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Original Explanation
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