# from collections import defaultdict
for _ in range(int(raw_input())):
    n=int(raw_input())
    arr=list(map(int,raw_input().split()))
    flag=0
    for i in range(0,n-2):
        if arr[i]+arr[i+1]<arr[i+2]:
            flag=1
            print i+1,i+2,i+3
            break

    if flag==0:
        print -1