题意：
给出n个数，对于每个数字找到一个欧拉函数值大于等于这个数的数，求找到的所有数的最小和。
思路：
Euler函数板子，注意N要设的大一点，不能只设成1e6，会RE
// Decline is inevitable,
// Romance will last forever.
//#include <bits/stdc++.h>
#include <iostream>
#include <cmath>
#include <cstring>
#include <string>
#include <cstdio>
#include <algorithm>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <deque>
#include <vector>
using namespace std;
#define mst(a, x) memset(a, x, sizeof(a))
#define INF 0x3f3f3f3f
#define mp make_pair
#define pii pair<int,int>
#define fi first
#define se second
#define ll long long
#define int long long
const int maxn = 1e6 + 10;
const int maxm = 1e3 + 10;
const int P = 1e9 + 7;
int phi[maxn];
void Getphi(int n) { //求1-n每个数的欧拉函数
for(int i = 1; i <= n; i++)
phi[i] = i;
for(int i = 2; i <= n; i++) {
if(phi[i] == i)
phi[i] = i - 1; //i是质数
for(int j = 2; j * i <= n; j++)
phi[i * j] = phi[j * i] / i * (i - 1);
}
}
void solve() {
int N = (int)1e6 + 8;
Getphi(N);
int t;
cin >> t;
for(int i = 1; i <= t; i++) {
int n;
cin >> n;
ll ans = 0;
for(int j = 1; j <= n; j++) {
int x;
cin >> x;
for(int k = x + 1;; k++)
if(phi[k] >= x) {
ans += k;
break;
}
}
cout << "Case " << i << ": " << ans << " Xukha" << endl;
}
}
signed main() {
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
// int T; scanf("%d", &T); while(T--)
// freopen("1.txt","r",stdin);
// freopen("output.txt","w",stdout);
// int T; cin >> T;while(T--)
solve();
return 0;
}