for test in range(0,int(input())):
    n=int(input())
    arr=[int(x) for x in input().split()]
    key=1
    for i in range(n-1,1,-1):
        if arr[i-1]+arr[i-2]<=arr[i] or arr[i-2]+arr[i]<=arr[i-1] or arr[i]+arr[i-1]<=arr[i-2]:
            print(i-1,i,i+1)
            key=0
            break
    if key==1:
        print(-1)