
import java.util.*;

public class Edu_91_Div_2_B
{

public static void main(String[] args) 
{
    Scanner sc = new Scanner(System.in);
    int t=sc.nextInt();
    while(t-->0)
    {
    	int n=sc.nextInt();
    	int[] arr=new int[n];
    	for(int i=0;i<n;i++)
    	{
    		arr[i]=sc.nextInt();
    	}
    	//System.out.println();
    	solve(arr);
    }
    sc.close();
 }

 public static void solve(int[] arr)
 {
	 for(int l=0;l<arr.length-2;l++)
	 {
		 int i=l,j=l+1,k=l+2;
		 if(arr[i]+arr[j]<arr[k])
		 {
			 System.out.println(i+" "+j+" "+k);
			 return ;
		 }
	 }
	 System.out.println(-1);
 }
}
