t = int(input())
while(t):
    n = int(input())
    arr = list(map(int, input().split()))
    flag1=0
    flag2=0
    for i in range(n-2):
        if (arr[i]+arr[i+1] <= arr[i+2]):
            print(i+1,i+2,i+3)
            flag1=1
            break
    if (flag1==0):
        print(-1)

    t-=1