#include <bits/stdc++.h>
using namespace std;
int main() {
  long long t, i, n, f, test;
  cin >> test;
  for (t = 0; t < test; t++) {
    cin >> n;
    f = 0;
    int a = -1;
    int v[n];
    for (i = 0; i < n; i++) cin >> v[i];
    if (n < 3)
      cout << -1 << endl;
    else {
      f = 0;
      for (i = 0; i < n - 2; i++) {
        if (v[i] + v[i + 1] <= v[i + 2]) {
          cout << i + 1 << " " << i + 2 << " " << i + 3 << endl;
          f = 1;
          break;
        }
      }
      if (f == 0) cout << -1 << endl;
    }
  }
}
