binary search in Lua

bin_search.lua

l={}

for i=1,1000000 do
    table.insert(l,i)
end

function b(t,i)
max=#t
low=1
    while low<=max do
        mid=math.ceil((max+low)/2)
        print("find:",max,low,mid)
            if t[mid]==i then
                return mid
            end
            if t[mid]>i then
                max = mid-1
            else
                low = mid+1
            end
    end
return "Not"
end

print(b(l,1))
print(b(l,1000000))
print(b(l,499999))