for _ in range(int(input())):
    n = int(input())
    x = list(map(int, input().split()))
    if n < 3:
        print(-1)
        continue

    for i in range(n - 2):
        if x[i] + x[i + 1] <= x[i + 2]:
            print(i + 1, i + 2, i + 3)
            break
    else:
        print(-1)