import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Collections;
import java.util.StringTokenizer;

public class Temp {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Solution sol = new Solution();
		int t = in.nextInt();
		for (int i = 0; i < t; ++i)
			sol.solve(in, out);
		out.close();
	}

	private static class Solution {
		private void solve(InputReader in, PrintWriter out) {
			int n = in.nextInt();
			int[] a = in.readArray(n);
			
			for (int i = 0; i < n - 2; ++i) {
				if (a[i] + a[i + 1] <= a[i + 2]) {
					out.println((i+1) + " " + (i+2) + " " + (i+3));
					return;
				}
			}
			out.println(-1);
		}
	}

	private static class InputReader {
		private BufferedReader reader;
		private StringTokenizer tokenizer;

		private InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		private String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

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

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

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