51nod 1965 奇怪的式子——min_25筛
摘要:
题目:http://www.51nod.com/Challenge/Problem.html#!#problemId=1965 考虑 \( \prod_{i=1}^{n}\sigma_0^i \) \(=\prod_{j=1}^{p_j<=n}\prod_{t=1}^{p_j^t<=n}(t+1)^ 阅读全文
posted @ 2019-01-18 14:47 Narh 阅读(192) 评论(0) 推荐(0) 编辑