T = int(input())
for _ in range(T):
    n = int(input())
    data = list(map(int, input().split()))
    isPos = False
    for i in range(len(data)-2):
        a, b, c = data[i:i+3]
        if (a+b) <= c:  # impos
            print(i+1, i+2, i+3)
            isPos = True
            break
    if not isPos:
        print(-1)
