import java.io.*;
import java.util.*;
import java.lang.*;
public class sample {
    public static void main(String[] args) throws IOException {
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        int t=Integer.parseInt(bf.readLine());
        while(t--!=0)
        {
            int n=Integer.parseInt(bf.readLine());
            long a[]=new long[n];int c=0;
            StringTokenizer s=new StringTokenizer(bf.readLine());
            for(int i=0;i<n;i++)
            {
                a[i]=Long.parseLong(s.nextToken());
            }
            for(int i=0;i<n-2;i++)
            {
                if(a[i]+a[i+1]<=a[i+2])
                {
                    System.out.println((i+1)+" "+(i+2)+" "+(i+3));
                    c=1;break;
                }
            }
            if(c==0)
                System.out.println(-1);
        }

    }
}
