#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    vector<int> v(n);
    for (int i = 0; i < n; i++) cin >> v[i];
    sort(v.begin(), v.end());
    int cnt = 1, g = 0;
    for (int i = 0; i < n; i++) {
      if (v[i] <= cnt) {
        g = i + 1;
      }
      cnt++;
    }
    cout << g + 1 << endl;
  }
}
