for _ in range(int(input())):
    n=int(input())
    arr=list(int(i) for i in input().split())
    flag=False
    for i in range(0,n-2):
        if arr[i]+arr[i+1]<=arr[i+2]:
            print(i+1,i+2,i+3)
            flag=True
            break
    if  not flag:
        print(-1)