import sys
input = sys.stdin.readline
t = int(input())
for _ in range(t):
    n = int(input())
    a = [int(_) for _ in input().split()]
    ok = False
    for i in range(n-2):
        if a[i+0] + a[i+1] <= a[i+2]:
            print(i+1, i+2, i+3)
            ok = True
            break
    if not ok:
        print(-1)
