假定n<m\[\sum_{isprime(p)}\sum_{a=1}^n\sum_{b=1}^mgcd(a,b)==p\]\[\sum_{isprime(p)}\sum_{a=1}^{\left\lfloor\frac{n}{p}\right\rfloor}\sum_{b=1}^{\left\lfloor\frac{m}{p}\right\rfloor}gcd(a,b)==1\]\[\sum_{isprime(p)}\sum_{a=1}^{\left\lfloor\frac{n}{p}\right\rfloor}\sum_{b=1}^{\left\lfloor\frac{m}{p}\right\rfloor}\sum_{d|a\&d|b}\mu(d)\]\[\sum_{isprime(p)}\sum_{d=1}^{\left\lfloor\frac{n}{p}\right...
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