1 files changed, 36 insertions, 18 deletions
diff --git a/challenge-003/abigail/lua/ch-1.lua b/challenge-003/abigail/lua/ch-1.lua
index 70de9b1923..3f0bf5b9fe 100644
--- a/challenge-003/abigail/lua/ch-1.lua
+++ b/challenge-003/abigail/lua/ch-1.lua
@@ -1,30 +1,48 @@
 #!/opt/local/bin/lua
 
 --
--- See ../README.md
+-- See https://theweeklychallenge.org/blog/perl-weekly-challenge-003
 --
 
 --
 -- Run as: lua ch-1.lua < input-file
 --
 
-for max in io . lines () do
-    local max = tonumber (max)
-    local base2 = 1
-    --
-    -- Lua doesn't have a for (expr; expr; expr) syntax.
-    -- This is missed here.
-    --
-    while base2 <= max do
-        local base3 = base2
-        while base3 <= max do
-            local base5 = base3
-            while base5 <= max do
-                print (base5)
-                base5 = base5 * 5
-            end
-            base3 = base3 * 3
+local ugly = {}
+ugly [1] = 1
+local next_2 = 1
+local next_3 = 1
+local next_5 = 1
+local count  = 1
+
+for n in io . lines () do
+    n = tonumber (n)
+    while count < n do
+        local c2 = 2 * ugly [next_2]
+        local c3 = 3 * ugly [next_3]
+        local c5 = 5 * ugly [next_5]
+
+        count = count + 1
+
+        if c2 <= c3 and c2 <= c5 then
+            ugly [count] = c2
+        end
+        if c3 <= c2 and c3 <= c5 then
+            ugly [count] = c3
+        end
+        if c5 <= c2 and c5 <= c3 then
+            ugly [count] = c5
+        end
+
+        if 2 * ugly [next_2] <= ugly [count] then
+            next_2 = next_2 + 1
+        end
+        if 3 * ugly [next_3] <= ugly [count] then
+            next_3 = next_3 + 1
+        end
+        if 5 * ugly [next_5] <= ugly [count] then
+            next_5 = next_5 + 1
         end
-        base2 = base2 * 2
     end
+    print (ugly [n])
 end