#include <bits/stdc++.h>
using namespace std;

int main() {
	int t,n;
	cin >> t;
	while(t--){
		cin >> n;
		int a[n];
		for(int i=0;i<n;i++){
			cin >> a[i];
		}
		vector<int> b;
		int num = 1;
		for(int i=0;i<n;i++){
			while(num == a[i])
				num++;
			b.push_back(num);
			num++;
		}
		cout << b.back() << endl;
		/*for(int i=0;i<b.size();i++){
			cout << b[i] << " ";
		}
		cout << endl;
		*/
	}
	return 0;
}