import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(in.readLine());
        for(int T=0;T<t;T++) {
            int n = Integer.parseInt(in.readLine());
            String[] inp = in.readLine().split("\\s+");
            int[] arr = new int[n];
            for(int i=0;i<arr.length;i++)
                arr[i] =  Integer.parseInt(inp[i]);
            int flag = 0;
            for (int i=n-1; i>=2; i--) {
                int c = arr[i];
                int b = arr[i-1];
                int a = arr[i-2];
                if (a+b<=c) {
                    System.out.println((i - 2) + " " + (i - 1) + " " + i);
                    flag = 1;
                    break;
                }
            }
            if(flag==0)
                System.out.println(-1);
        }
    }
}