import java.util.Scanner;

public class BadTraingle {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t  =sc.nextInt();
        while(t-->0)
        {   
            int n = sc.nextInt();
            long arr[] = new long[n];
            for(int i=0 ; i<n ; i++)
            arr[i] = sc.nextLong();

            int j=2;
            int k=0;
            long sum =0;
            boolean b = false;
            while(j<n&&k<n-2)
            {   sum = arr[k]+arr[k+1];
                if(sum<arr[j])
                 {  b=true;  break;}
                else
                k++;
                j++;
            }
            j++;
            k++;
            int u = k+1;
            if(b)
            System.out.println(k+" "+u+" "+j);
            else
            System.out.println("-1");
        }
    }
}