for _ in range(int(input())):

    n = int(input())

    arr = list(map(int,input().strip().split()))
    flag = 0
    for x in range(1,n):

        for y in range(x, n):

            if arr[x-1] + arr[x] <= arr[y] or arr[x-1] + arr[y] <= arr[x] or arr[x] + arr[y] <= arr[x-1]:
                print(x-1,x,y)
                flag = 1
                break

    if flag == 1:
        print("-1")