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Re:F(N)=,∑gcd(i, N) 1<=i <=N是积性函数吗，我假定这个AC了，但我没严格证明，谁来证明一下?In Reply To:Re:F(N)=,∑gcd(i, N) 1<=i <=N是积性函数吗，我假定这个AC了，但我没严格证明，谁来证明一下? Posted by:380757580 at 2008-08-05 23:09:53 > > > 我真傻...真的... >如果两个数相同的话不能分开来求要用公式a*(p^a-p^(a-1))+p^a >a是幂指数, Followed by:
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