for j in range(int(input())):
	n = int(input())
	li = [int(x) for x in input().split()]

	for i in range(len(li) - 2):
		if li[i] + li[i + 1] <= li[i + 2]:
			print(i + 1, i + 2, i + 3)
			break
	else:
		print(-1)

