t=int(input())
for i in range(t):
    n=int(input())
    arr=list(map(int,input().split()))
    ans=[]
    for i in range(len(arr)-2):
        if arr[i]+arr[i+1]<=arr[i+2]:
            ans.append(i+1)
            ans.append(i+2)
            ans.append(i+3)
            break
    if len(ans)==0:
        print(-1)
    else:
        print(*ans,sep=" ")