#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long int t = 1;
  cin >> t;
  while (t--) {
    long long int n, a, b, c, p = 0;
    cin >> n;
    long long int A[n], i;
    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]) {
        p = 1;
        cout << i << " " << i + 1 << " " << i + 2 << "\n";
        break;
      }
    if (p == 0) cout << -1 << "\n";
  }
  return 0;
}
