def main():
    test=int(input())
    for _ in range(test):
        len=int(input())
        arr=list(map(int,input().split()))
        i=0
        for j in arr[i+2:]:
            sum=arr[i]+arr[i+1]
            if j>=sum:
                print(i+1,i+2,arr.index(j)+1)
                break
            else:
                i+=1
        else:
            print(-1)


main()