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这道题积性函数对吗？？假设f(N)为结果，若a*b=N且二者互质，那么f(N)=f(a)*f(b)对吗？ 我只知道f(N)=1^3+2^3+...+g(N)^3 其中g(N)是N的因子个数 而且g(N)=g(a)*g(b),这个是正确的。可f(N)=f(a)*f(b)对吗？ Followed by:
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