poj3030(欧拉函数）

Visible Lattice Points

Time Limit: 1000MS   Memory Limit: 65536K
Total Submissions: 8101   Accepted: 4963

Description

A lattice point (x, y) in the first quadrant (x and y are integers greater than or equal to 0), other than the origin, is visible from the origin if the line from (0, 0) to (x, y) does not pass through any other lattice point. For example, the point (4, 2) is not visible since the line from the origin passes through (2, 1). The figure below shows the points (x, y) with 0 ≤ x, y ≤ 5 with lines from the origin to the visible points.

Write a program which, given a value for the size, N, computes the number of visible points (x, y) with 0 ≤ x, y ≤ N.

Input

The first line of input contains a single integer C (1 ≤ C ≤ 1000) which is the number of datasets that follow.

Each dataset consists of a single line of input containing a single integer N (1 ≤ N ≤ 1000), which is the size.

Output

For each dataset, there is to be one line of output consisting of: the dataset number starting at 1, a single space, the size, a single space and the number of visible points for that size.

Sample Input

4
2
4
5
231

Sample Output

1 2 5
2 4 13
3 5 21
4 231 32549观察可看出，（1,0）（0,1）（1,1）所在直线只能有一个点求出函数y=kx,若k为整数，直线上必定只有一个点可以被看到，所以只要（x,y）满足gcd(x,y)=1，即k为非整数由图看出，y=x,两边对称，所以可只计算一边即可满足条件的解即为phi(y)

原文地址：https://www.cnblogs.com/lmjer/p/9090270.html

时间： 2024-11-13 10:20:32

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