t = int(input())
for _ in range(t):
    n = int(input())
    a = list(map(int,input().split()))
    find = False
    for i in range(0,n-2):
        x = a[i]
        y = a[i+1]
        z = a[i+2]
        if x + y <= z:
            find = True
            break
    if find:
        print(i+1,i+2,i+3)
    else:
        print(-1)