7481: Tetrahedron
内存限制：128 MB
时间限制：4 S
题面：传统
评测方式：文本比较
上传者：
提交：13
通过：12
题目描述
Generate three integers a, b, and c in [1,n] with equal probability independently, and use them as the three right-angle side length of a right-angled tetrahedron. Find the expectation of the reciprocal square of the distance from the right-angle apex to the slope (Euclidean distance).
For each test case, output a line containing the answer mod 998244353.
输入格式
In the first line, you should read an integer T denoting the number of test cases.
In every test case, the only line will include an integer n.
It is guaranteed that T is no larger than 2×106 and n is no larger than 6×106.
In every test case, the only line will include an integer n.
It is guaranteed that T is no larger than 2×106 and n is no larger than 6×106.
输出格式
For each test case, output the only line containing just one integer denoting the answer mod 998244353.
输入样例 复制
3
1
2
3输出样例 复制
3
124780546
194103070