import java.util.*;
public class BadTriangle {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        while(t!=0) {
            int length = sc.nextInt();
            if(length<3) {
                System.out.println(-1);
                t--;
                continue;
            }
            int arr[] = new int[length];
            for(int i = 0; i< length; i++) {
                arr[i] = sc.nextInt();
            }
            for(int i = 0; i+2 < length; i++) {
                if(arr[i]+arr[i+1] <= arr[length-1]) {
                    System.out.println(i+1+' '+(i+2)+' '+length);
                    break;
                }
            }
            t--;
        }
    }
}
