for i in range(int(input())):
	n = int(input())
	s = [int(i) for i in input().split()]
	a = []
	for i in range(n-2):
		if s[i]+s[i+1]<=s[i+2]:
			a = [i+1,i+2,i+3]
			break
	if a:
		print(*a)
	else:
		print(-1)