import java.io.*;
import java.util.*;
import java.math.*;
import java.lang.*;

import static java.lang.Math.*;


public class CodeForce {
    static class InputReader
    {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;
        private BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        public InputReader(InputStream stream)
        {
            this.stream = stream;
        }

        public int read()
        {
            if (numChars==-1)
                throw new InputMismatchException();

            if (curChar >= numChars)
            {
                curChar = 0;
                try
                {
                    numChars = stream.read(buf);
                }
                catch (IOException e)
                {
                    throw new InputMismatchException();
                }

                if(numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public String nextLine()
        {
            String str = "";
            try
            {
                str = br.readLine();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return str;
        }
        public int nextInt()
        {
            int c = read();

            while(isSpaceChar(c))
                c = read();

            int sgn = 1;

            if (c == '-')
            {
                sgn = -1;
                c = read();
            }

            int res = 0;
            do
            {
                if(c<'0'||c>'9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));

            return res * sgn;
        }

        public long nextLong()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-')
            {
                sgn = -1;
                c = read();
            }
            long res = 0;

            do
            {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
            return res * sgn;
        }

        public double nextDouble()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-')
            {
                sgn = -1;
                c = read();
            }
            double res = 0;
            while (!isSpaceChar(c) && c != '.') {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, nextInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            if (c == '.')
            {
                c = read();
                double m = 1;
                while (!isSpaceChar(c))
                {
                    if (c == 'e' || c == 'E')
                        return res * Math.pow(10, nextInt());
                    if (c < '0' || c > '9')
                        throw new InputMismatchException();
                    m /= 10;
                    res += (c - '0') * m;
                    c = read();
                }
            }
            return res * sgn;
        }

        public String readString()
        {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do
            {
                res.appendCodePoint(c);
                c = read();
            }
            while (!isSpaceChar(c));

            return res.toString();
        }

        public boolean isSpaceChar(int c)
        {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public String next()
        {
            return readString();
        }

        public interface SpaceCharFilter
        {
            public boolean isSpaceChar(int ch);
        }

    }
    public static long pow(long n,long p,long MOD)
    {
        if(p==0)
            return 1;
        if(p==1)
            return n;
        long ans = pow(n,p/2,MOD);
        ans = ((ans%MOD)*(ans%MOD))%MOD;
        if(p%2!=0)
            ans = ((ans%MOD)*(n%MOD))%MOD;
        return ans;
    }
    public static long npow(long n,long p)
    {
        if(p==0)
            return 1;
        if(p==1)
            return n;
        long ans = npow(n,p/2);
        ans = ans*ans;
        if(p%2!=0)
            ans = ans*n;
        return ans;
    }
    public static int gcd(int a,int b)
    {
        if(a==0 && b==0)
            return -1;
        if(a==0)
            return b;
        return gcd(b%a,a);
    }
    public static void sieve(int[] spf, int n)
    {
        spf[1] = 1;
        for (int i=2; i<n; i++)
            spf[i] = i;

        for (int i=4; i<n; i+=2)
            spf[i] = 2;

        for (int i=3; i*i<n; i++)
        {
            if (spf[i] == i)
            {
                for (int j=i*i; j<n; j+=i)
                    if (spf[j]==j)
                        spf[j] = i;
            }
        }
    }
    public static ArrayList<Long> primeFactor(long k){
        ArrayList<Long> no = new ArrayList<>();
        while (k%2==0)
        {
            no.add((long)2);
            k /= 2;
        }
        for (int i = 3; i<=Math.sqrt(k); i+= 2)
        {
            while (k%i == 0)
            {
                no.add((long)i);
                k /= i;
            }
        }
        if(k>2)
            no.add(k);
        return no;
    }


    public static void main(String args[]) throws Exception
    {
        InputReader sc = new InputReader(System.in);
        PrintWriter w = new PrintWriter(System.out);
        int MOD = 1000000007;
        int tc=sc.nextInt();
        while(tc-->0)
        {
            int n = sc.nextInt();
            int a[] = new int[n];
            for(int i=0;i<n;i++){
                a[i] = sc.nextInt();
            }
            boolean flag=false;
            for(int i=0;i<n-2;i++){
                int p = a[i];
                int q = a[i+1];
                int r = a[i+2];
                if(((p+q)<=r) || ((q+r)<=p) || ((p+r)<=q)){
                    w.println((i+1)+" "+(i+2)+" "+(i+3));
                    flag=true;
                    break;
                }
            }
            if(flag==false)
                w.println("-1");
        }
        System.out.flush();
        w.close();
    }
}