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