import java.util.Arrays;
import java.util.Scanner;
import java.lang.Math;


public class codeforces {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int test=sc.nextInt();
        while(test-->0){
            int n=sc.nextInt();
            int arr[]=new int[n];
            for(int i=0;i<n;i++){
                arr[i]=sc.nextInt();
            }
            boolean flag=true;
            for(int i=0;i<n-2;i++){
                if(arr[i]+arr[i+1]>arr[i+2]){
                    System.out.print(i+" ");
                    System.out.print(i+1+" ");
                    System.out.print(i+2+" ");
                    flag=false;
                    break;
                }
            }
            if(flag)System.out.println(-1);

            
        }
        
        
            

        
    }
    
}
