test=int(input())
for _ in range(test):
    n=int(input())
    list1=list(map(int,input().split()))
    for i in range(2,len(list1)):
        if list1[i-2]<list1[i-1]+list1[i] and list1[i]<list1[i-2]+list1[i-1] and list1[i-1]<list1[i-2]+list1[i]:
            continue
        else:
            print(i-1,i,i+1)
            break

    else:
        print("-1")