PUMaC 2025 · 数论（A 组） · 第 1 题
PUMaC 2025 — Number Theory (Division A) — Problem 1
题目详情
- Find the sum of all positive integers n < 2025 such that gcd( n + 1 , 2 n + 1) > 1. 4
解析
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Original Explanation
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PUMaC 2025 — Number Theory (Division A) — Problem 1
暂无解答链接。
No solutions link available.