/*package whatever //do not write package name here */

import java.util.*;
import java.lang.*;
import java.io.*;

public class Solution {

    static void badTriangle(int[] A) {
        int a = -1,b = -1,c = -1;
        for(int i = 1; i < A.length - 2; i++) {
            if(A[i] + A[i+1] <= A[i+2]) {
                a = i;
                b = i + 1;
                c = i + 2;
                break;
            }
        }
        if(a == -1 || b == -1 || c == -1) 
        System.out.println(""+(-1));
        else
        System.out.println(a+" "+b+" "+c);


    
    }

	public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        while(t-- != 0) {
            int n = sc.nextInt();
            int[] a = new int[n+1];
            for(int i = 1; i <= n; i++)
            a[i] = sc.nextInt();
            badTriangle(a);
        }
		//code
	}
}