for test in range(0,int(input())):
    n=int(input())
    arr=[int(x) for x in input().split()]
    key=1
    for i in range(0,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)
            key=0
            break
    if key==1:
        print(-1)
