摘要： 题意： f(n) = sigma(gcd(i,n)) 1 <= i <= n g(n) = sigma(f(d)) d | n n = x1 * x2 * ... * xm 其中 x[i+1] = (a * x[i] + b) % c + 1 1 <= m <= 10^18 1 <= c <= 10 阅读全文