for _ in range(int(input())):
    n = int(input())
    A = list(map(int,input().split()))
    if not A[n-1]>= A[0]+A[1]:
        print(-1)
    else:
        for i in range(n-2):
            if A[i+2]>= A[i]+A[i+1]:
                print(i+1, i+2,i+3)
                break
