#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    if (n == 1) {
      cout << "-1\n";
      continue;
    }
    for (int i = 0; i < n; i++) {
      if (i == 0)
        cout << 5;
      else
        cout << 3;
    }
    cout << "\n";
  }
}
