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27 lines
733 B
27 lines
733 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 1010;
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// 欧拉函数
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int phi(int x) {
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int res = x;
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for (int i = 2; i * i <= x; i++) // 从2枚举到sqrt(x)
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if (x % i == 0) { // 如果i是x的小因子
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res = res / i * (i - 1);
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while (x % i == 0) x /= i; //
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}
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if (x > 1) res = res / x * (x - 1);
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return res;
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}
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int main() {
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int n, m;
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cin >> m;
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for (int i = 1; i <= m; i++) {
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cin >> n;
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int res = 1; // x=y 记1个
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for (int j = 1; j <= n; j++) res += phi(j) * 2; // 叠加两倍的欧拉函数值
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printf("%d %d %d\n", i, n, res);
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}
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return 0;
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} |