diff --git a/primes-alt.lua b/primes-alt.lua
new file mode 100644
index 0000000..603abcb
--- /dev/null
+++ b/primes-alt.lua
@@ -0,0 +1,46 @@
+function get_primes7(n)
+	if n < 2 then return {} end
+	if n == 2 then return {2} end
+
+	local s = {}
+	local c = 1
+	for i = 3, n, 2 do
+		s[c] = i
+		c = c + 1
+	end
+
+	local mroot = math.floor(math.sqrt(n))
+	local half = #s
+	local i = 0
+	local m = 3
+
+	while m <= mroot do
+		if s[i+1] and s[i+1] ~= 0 then
+			local j = math.floor((m*m-3)/2) -- int div
+			s[j+1] = 0
+			while j < half do
+				s[j+1] = 0
+				j = j + m
+			end
+		end
+		i = i + 1
+		m = 2*i + 3
+	end
+
+	local res = {}
+	res[1] = 2
+
+	local c = 2
+	for x = 1, #s do
+		if s[x] ~= 0 then
+			res[c] = s[x]
+			c = c + 1
+		end
+	end
+	return res
+end
+
+for i = 1, 30 do
+	local res = get_primes7(10000000)
+	print("Found " .. #res .. " prime numbers.")
+end