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如何证明积性函数？In Reply To: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:YUMEN19850720 at 2006-10-19 23:14:52 Followed by:
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