#include <iostream>

using namespace std;

int t;

int main()
{
    cin >> t;
    while (t -- )
    {
        int n;
        cin >> n;
        int m = 1;
        while (m * (m - 1) / 2 <= n) m ++ ;
        m -- ;
        cout << "133";
        for (int i = 0; i < n - m * (m - 1) / 2; i ++ ) cout << '7';
        for (int i = 0; i < m - 2; i ++ ) cout << '3';
        cout << '7' << endl;
    }
    return 0;
}