import java.util.*;
public class Solution {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int t = Integer.parseInt(scan.nextLine());
        while(t-->0)
        {
            int n = Integer.parseInt(scan.nextLine());
            int[] a = new int[n];
            String[] s = scan.nextLine().split(" ");
            for(int i=0;i<n;i++) a[i] = Integer.parseInt(s[i]);
            int sum=0;
            int flag=0;
            int i;
            for(i=0;i<n-2;i++) {
                sum = a[i] + a[i+1];
                if(sum <= a[i+2]) {
                    flag = 1;
                    break;
                }
            }
            if(flag==1) System.out.println((i+1)+ " "+ (i+2)+ " " +(i+3));
            else System.out.println(-1);
        }
    }
}