t=int(input())
for _ in range(t):
    n=int(input())
    arr=input().split()
    for i in range(n):
        arr[i]=int(arr[i])
    f=True
    for i in range(n-2):
        if arr[i]+arr[i+1]<=arr[i+2]:
            print(i+1,i+2,i+3)
            f=False
            break    
    if f:
        print("-1")