import java.util.Scanner;

public class Edu93_A {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scan = new Scanner(System.in);
		int t = scan.nextInt();
//		int ans[] = new int[t];
		for(int p = 0; p <t; p++) {
			int n = scan.nextInt();
			int arr[] = new int[n];
			for(int i = 0 ; i< n; i++) {
				arr[i] = scan.nextInt();
			}
			boolean f = false;
			for(int i = 0; i<n-2; i++) {
				if((arr[i]+arr[i+1])<arr[i+2]) {
					System.out.println((i+1)+" "+(i+2)+" "+(i+3));
					f=true;
					break;
				}
			}
			if(f==false) {
				System.out.println(-1);
			}
		}
	}

}
