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