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C是指组合数么？

Posted by RoBa at 2008-10-25 21:16:53
In Reply To:Re:说说啥题? Posted by:swgr at 2008-10-25 21:00:57 
> 给出n，求F(n)。
> 
> F(n) = sigma(i = 3 to n) Gcd(i);
> 
> Gcd(x) = gcd(C(1,x),C(2,x),...,C(x-1,x))
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