Merge remote-tracking branch 'upstream/master'

1 files changed, 30 insertions, 0 deletions

diff --git a/challenge-171/deadmarshal/lua/ch-1.lua b/challenge-171/deadmarshal/lua/ch-1.lua
new file mode 100644
index 0000000000..fa400501ce
--- /dev/null
+++ b/challenge-171/deadmarshal/lua/ch-1.lua
@@ -0,0 +1,30 @@
+local function divisors_sum(n)
+   assert(type(n) == 'number', 'n must be a number!')
+   if n < 2 then return 0 end
+   local sqrt, sum = math.sqrt(n), 0
+   for i = 2, sqrt do
+      if n % i == 0 then
+	 sum = sum + i
+	 if i ~= sqrt then sum = sum + (n // i) end
+      end
+   end
+   sum = sum + 1
+   return sum
+end
+
+local function abundant_odd_numbers()
+   local t,i = {},1
+   repeat
+      if divisors_sum(i) > i and
+	 (i % 2) ~= 0 then
+	 t[#t+1] = i
+      end
+      i = i + 1
+   until #t == 20
+   return t
+end
+
+local t = abundant_odd_numbers()
+for i=1, #t do
+   io.write(t[i], ' ')
+end