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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?

Posted by 380757580 at 2008-08-05 20:08:03 on Problem 2480 and last updated at 2008-08-05 20:08:53
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 
咦？？
F(4) = F(2) * F(2)
 8   =  3 * 3 
这里为什么会有错？...
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