for t in range(int(input())):
    n=int(input())
    l=list(map(int,input().split()))
    f=0
    for i in range(n-2):
        if l[i]+l[i+1]<l[i+2]:
            print(i+1,i+2,i+3)
            f=1
            break
    if(f==0):
        print(-1)