t=int(input())
for _ in range(t):
    n=int(input())
    arr=[int(x) for x in input().split()]
    li=[]
    flag = True
    for i in range(n):
        if len(li) == 0:
            li.append(i+1)
        elif len(li) > 2:
            break
        else:
            #print(arr[i] - arr[li[-1]],li,)
            if arr[i] - arr[li[-1]]  < 2:
                #print('yes')
                if flag:
                    li.append(i+1)
                    flag =False
            else:
                li.append(i+1)
    if len(li) == 3:
        print(*li)
    else:
        print("-1")
    