for _ in range(int(input())):
    n=int(input())
    alist=list(map(int,input().split()))
    flag=0
    a=0
    b=0
    c=0
    for i in range(n-2):
        if(alist[i]+alist[i+1]<alist[i+2]):
            flag=1
            a=i+1
            b=i+2
            c=i+3
            break;
    if(flag==1):
        print(a,b,c)
    else:
        print("-1")