#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int t, n;
  cin >> t;
  while (t--) {
    cin >> n;
    long long int a[n], g, c = 0;
    for (long long int i = 0; i < n; i++) cin >> a[i];
    for (long long int i = 2; i < n; i++) {
      if (a[i - 2] + a[i - 1] > a[i]) {
        c++;
        g = i;
      }
    }
    if (c == n - 2)
      cout << "-1\n";
    else
      cout << g - 2 << " " << g - 1 << " " << g << "\n";
  }
  return 0;
}
