t = int(input())

for _ in range(t):
    n = int(input())
    a = list(map(int, input().split()))
    i1, i2, i3 = a[0], a[1], a[-1]
    for i in range(n-2):
        if i1 + i2 < i3 or i1 + i3 < i2 or i3 + i2 < i1:
            print(1, 2, n)
            break
    else:
        print(-1)
