PUMaC 2025 · 团队赛 · 第 8 题
PUMaC 2025 — Team Round — Problem 8
题目详情
- Compute the number of ordered pairs ( a, b ) of positive integers satisfying ab ≤ 100 and gcd( a, b ) + lcm( a, b ) = a + b. 2
解析
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Original Explanation
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