add old solutions

1 files changed, 20 insertions, 0 deletions

diff --git a/14.lua b/14.lua
new file mode 100644
index 0000000..96498ec
--- /dev/null
+++ b/14.lua
@@ -0,0 +1,20 @@
+function collatz(n)
+    local sum = 1
+    while true do
+        if n == 1 then break end
+        if n % 2 == 0 then n = n / 2
+        else n = n * 3 + 1 end
+        sum = sum + 1
+    end
+    return sum
+end
+
+local max = 0
+local maxnum = 0
+for i = 1, 999999 do
+    local sum = collatz(i)
+    print(i .. ": " .. sum)
+    if sum > max then max = sum; maxnum = i end
+end
+print("--------")
+print(maxnum .. ": " .. max)