t=int(input())
for i in range(t):
    n=int(input())
    arr=list(map(int,raw_input().split()))

    def solve(arr,n):
        for i in range(n-2):
            if arr[i]+arr[i+1]<=arr[i+2] or arr[i]+arr[i+2]<=arr[i+1] or arr[i+1]+arr[i+2]<=arr[i]:
                print i+1,i+2,i+3
                return
        print(-1)
    solve(arr,n)