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