import java.io.*;
import java.util.*;
public class A {
    final static long mod = (long)10e9+7;
    public static void main(String[] args) {
        InputReader sc = new InputReader(System.in);
        PrintWriter pw = new PrintWriter(System.out);
        Random gen = new Random();
        int test = sc.nextInt();
        while(test-->0) {
            StringBuffer sb = new StringBuffer();
            int n = sc.nextInt();
            long [] ar = new long[n];
            for(int i=0;i<n;i++)
                ar[i] = sc.nextLong();
            boolean f = true;
            for(int i=1;i<n-1;i++)
            {
                if(ar[i-1]+ar[i]<=ar[i+1])
                {
                    sb.append(i).append(" ").append(i+1).append(" ").append(i+2);
                    f = false;
                    break;
                }
            }
            if(!f)
                pw.println(sb);
            else
                pw.println(-1);


        }
        pw.close();

    }




















































































































































































    static class Data implements Comparable<Data>{
        int x, a;

        public Data (int m, int n) {
            x = m;
            a = n;
        }
        @Override
        public int compareTo(Data o) {
            return a - o.a;
        }
    }
    public static class Debug {
        //change to System.getProperty("ONLINE_JUDGE")==null; for CodeForces
        public static final boolean LOCAL = System.getProperty("LOCAL")!=null;
        private static <T> String ts(T t) {
            if(t==null) {
                return "null";
            }
            try {
                return ts((Iterable) t);
            }catch(ClassCastException e) {
                if(t instanceof int[]) {
                    String s = Arrays.toString((int[]) t);
                    return "{"+s.substring(1, s.length()-1)+"}";
                }else if(t instanceof long[]) {
                    String s = Arrays.toString((long[]) t);
                    return "{"+s.substring(1, s.length()-1)+"}";
                }else if(t instanceof char[]) {
                    String s = Arrays.toString((char[]) t);
                    return "{"+s.substring(1, s.length()-1)+"}";
                }else if(t instanceof double[]) {
                    String s = Arrays.toString((double[]) t);
                    return "{"+s.substring(1, s.length()-1)+"}";
                }else if(t instanceof boolean[]) {
                    String s = Arrays.toString((boolean[]) t);
                    return "{"+s.substring(1, s.length()-1)+"}";
                }
                try {
                    return ts((Object[]) t);
                }catch(ClassCastException e1) {
                    return t.toString();
                }
            }
        }
        private static <T> String ts(T[] arr) {
            StringBuilder ret = new StringBuilder();
            ret.append("{");
            boolean first = true;
            for(T t: arr) {
                if(!first) {
                    ret.append(", ");
                }
                first = false;
                ret.append(ts(t));
            }
            ret.append("}");
            return ret.toString();
        }
        private static <T> String ts(Iterable<T> iter) {
            StringBuilder ret = new StringBuilder();
            ret.append("{");
            boolean first = true;
            for(T t: iter) {
                if(!first) {
                    ret.append(", ");
                }
                first = false;
                ret.append(ts(t));
            }
            ret.append("}");
            return ret.toString();
        }
        public static void dbg(Object... o) {
            if(LOCAL) {
                System.err.print("Line #"+Thread.currentThread().getStackTrace()[2].getLineNumber()+": [");
                for(int i = 0; i<o.length; i++) {
                    if(i!=0) {
                        System.err.print(", ");
                    }
                    System.err.print(ts(o[i]));
                }
                System.err.println("]");
            }
        }
    }


    static class InputReader {

        private final InputStream stream;
        private final byte[] buf = new byte[8192];
        private int curChar, snumChars;

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

        public int read() {
            if (snumChars == -1)
                throw new InputMismatchException();
            if (curChar >= snumChars) {
                curChar = 0;
                try {
                    snumChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (snumChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                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 {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

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

        public static int[] shuffle(int[] a, Random gen)
        { for(int i = 0, n = a.length;i < n;i++)
        { int ind = gen.nextInt(n-i)+i;
            int d = a[i];
            a[i] = a[ind];
            a[ind] = d;

        }
            return a;
        }


        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 String nextLine() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isEndOfLine(c));
            return res.toString();
        }

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

        private boolean isEndOfLine(int c) {
            return c == '\n' || c == '\r' || c == -1;
        }

    }

}
