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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 23:09:53 on Problem 2480
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 20:08:03 
> 咦？？
> F(4) = F(2) * F(2)
>  8   =  3 * 3 
> 这里为什么会有错？...


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