add old solutions

1 files changed, 21 insertions, 0 deletions

diff --git a/10.lua b/10.lua
new file mode 100644
index 0000000..cca16c1
--- /dev/null
+++ b/10.lua
@@ -0,0 +1,21 @@
+function isprime(n)
+    if n < 2 then return false end
+    if n == 2 then return true end
+    if math.fmod(n, 2) == 0 then return false end
+    for i = 3, math.ceil(math.sqrt(n)), 2 do
+        if math.fmod(n, i) == 0 then return false end
+    end
+    return true
+end
+
+local i = 3
+local sum = 2
+while true do
+    if i >= 1000000 then break end
+    if isprime(i) then
+        if sum + i < sum then print("overflow") end
+        sum = sum + i
+    end
+    i = i + 2
+end
+print(sum)