Merge remote-tracking branch 'upstream/master'

1 files changed, 53 insertions, 0 deletions

diff --git a/challenge-133/abigail/lua/ch-2.lua b/challenge-133/abigail/lua/ch-2.lua
new file mode 100644
index 0000000000..45120a21b3
--- /dev/null
+++ b/challenge-133/abigail/lua/ch-2.lua
@@ -0,0 +1,53 @@
+#!/opt/local/bin/lua
+
+--
+-- See ../README.md
+--
+
+--
+-- Run as: lua ch-2.lua
+--
+
+local small_primes = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31}
+
+function factorize (num)
+    local out = {}
+    for _, prime in ipairs (small_primes) do
+        while num % prime == 0 do
+            table . insert (out, prime)
+            num = num / prime
+        end
+    end
+    if num > 1 then
+        table . insert (out, num)
+    end
+    return (out)
+end
+
+
+function digit_sum (numbers)
+    local sum = 0
+    for _, number in pairs (numbers) do
+        while number > 0 do
+            sum = sum + number % 10
+            number = math . floor (number / 10)
+        end
+    end
+    return (sum)
+end
+
+
+local number = 1
+local count  = 0
+
+
+while count < 10 do
+    local factors = factorize (number)
+    if #factors > 1 then
+        if digit_sum ({number}) == digit_sum (factors) then
+            print (number)
+            count = count + 1
+        end
+    end
+    number = number + 1
+end