#BZOJ4805. 欧拉函数求和
欧拉函数求和
No submission language available for this problem.
题目描述
给出一个数字N,求sigma(phi(i)),1<=i<=N
输入格式
正整数N。N<=2*10^9
输出格式
输出答案。
10
32
No submission language available for this problem.
10
32
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