import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.io.*;
public class a {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		FastReader fr = new FastReader();
		PrintWriter op = new PrintWriter(System.out);
		int t = fr.nextInt();
		while(t-- >0)
		{
			int res1=-1, res2=-1, res3=-1;
			int n = fr.nextInt();
			int []a= new int[n];
			for(int i =0; i < n; i++)
			{
				a[i] = fr.nextInt();
			}
			for(int i =0 ; i<=n-3; i++)
			{
				if(((a[i]+a[i+1])> a[i+2]) && ((a[i+2]+a[i+1])> a[i]) && ((a[i]+a[i+2])> a[i+1]))
					{
						continue;
					}
				else
				{
					res1 = i+1;
					res2 = i+2;
					res3 = i+3;
				}
			}
			if(res1+res2+res3==-3)
			{
				op.println("-1");
			}
			else
			{
				op.println(res1+" "+res2+" "+res3);
			}
		}
		op.flush();
		op.close();
	}
	static class FastReader {
		BufferedReader br;
		StringTokenizer st;

		public FastReader() {
			br =new BufferedReader(new InputStreamReader(System.in));
		}

		String next() {
			while (st==null || (!st.hasMoreElements())) 
			{
				try
				{
					st =new StringTokenizer(br.readLine());
				}
				catch(IOException e)
				{
					e.printStackTrace();
				}
				
			}
			return st.nextToken();
		}

		String nextLine() {
			String str ="";

			try
			{
				str =br.readLine();
			}
			catch(IOException e)
			{
				e.printStackTrace();
			}

			return str;
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		long nextLong() {
			return Long.parseLong(next()) ;
		}
	}
}
