
// Submitted By Subhash Yadav
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Scanner;

import java.util.*;

public class D {

	public static void main(String[] args) {
		FastScanner sc = new FastScanner();
		int t = sc.nextInt();
		while (t-- > 0) {;
		
int n=sc.nextInt();
long a[]=new long[n];
for(int i=0;i<n;i++) a[i]=sc.nextLong();
boolean b=false;
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));
	    	b=true;
	    	break;
	    }
}
		
if(!b) System.out.println(-1);
		


		}
	}

	static class FastScanner {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer("");

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

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

		int[] readArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = nextInt();
			return a;
		}

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

		double nextDouble() {
			return Double.parseDouble(next());
		}
	}

}