for i in xrange(int(raw_input())):
    n = int(raw_input())
    ar = map(int, raw_input().split())

    deu = False
    for k in xrange(n-2):

        if (not abs(ar[k] - ar[k + 1]) < ar[k + 2] < ar[k] + ar[k+1]) or (not abs(ar[k] - ar[k + 2]) < ar[k + 1] < ar[k] + ar[k+2]) or  (not abs(ar[k + 2] - ar[k + 1]) < ar[k] < ar[k + 2] + ar[k+1]):
            deu = True
            print k+1, k+2, k+3
            break
    
    if not deu:
        print -1
