#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int i = 0;
    int n;
    cin >> n;
    int sides[1000000];
    int flag = 0;
    for (int i = 1; i <= n; i++) {
      cin >> sides[i];
    }
    for (i = 3; i <= n; i++) {
      if (sides[i] >= (sides[i - 1] + sides[i - 2])) {
        cout << i - 2 << " " << i - 1 << " " << i << endl;
        break;
      }
    }
    if (i > n) cout << "-1" << endl;
  }
  return 0;
}
