#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    long long int* arr = new long long int[n];
    for (int i = 0; i < n; i++) {
      cin >> arr[i];
    }
    long long int id1 = -1, id2 = -1, id3 = -1;
    long long int sum = 0;
    int i = 0;
    while (i < n - 2) {
      if (arr[i] + arr[i + 1] >= arr[i + 2]) {
        i++;
        continue;
      } else {
        id1 = i + 1;
        id2 = i + 2;
        id3 = i + 3;
        break;
      }
    }
    if (id1 == -1) {
      cout << -1 << endl;
    } else {
      cout << id1 << " " << id2 << " " << id3 << endl;
    }
  }
  return 0;
}
