import sys
if sys.subversion[0] == "PyPy":
    import io, atexit
    sys.stdout = io.BytesIO()
    atexit.register(lambda: sys.__stdout__.write(sys.stdout.getvalue()))
    
    sys.stdin = io.BytesIO(sys.stdin.read())
    input = lambda: sys.stdin.readline().rstrip()

RS = raw_input
RI = lambda x=int: map(x,RS().split())
RN = lambda x=int: x(RS())
''' ...................................................................... '''

for _ in xrange(RN()):
    n = RN()
    arr = RI()
    ans = -1
    for i in xrange(n-2):
        a,b,c = arr[i],arr[i+1],arr[i+2]
        if a+b<=c:
            ans = i
            break

    if ans==-1: print -1
    else: print i+1,i+2,i+3
