1 files changed, 76 insertions, 0 deletions
diff --git a/challenge-171/roger-bell-west/lua/ch-1.lua b/challenge-171/roger-bell-west/lua/ch-1.lua
new file mode 100755
index 0000000000..39d8abbf8c
--- /dev/null
+++ b/challenge-171/roger-bell-west/lua/ch-1.lua
@@ -0,0 +1,76 @@
+#! /usr/bin/lua
+
+-- by Michael Anderson at
+-- https://stackoverflow.com/questions/8722620/comparing-two-index-tables-by-index-value-in-lua
+function recursive_compare(t1,t2)
+  -- Use usual comparison first.
+  if t1==t2 then return true end
+  -- We only support non-default behavior for tables
+  if (type(t1)~="table") then return false end
+  -- They better have the same metatables
+  local mt1 = getmetatable(t1)
+  local mt2 = getmetatable(t2)
+  if( not recursive_compare(mt1,mt2) ) then return false end
+
+  -- Check each key-value pair
+  -- We have to do this both ways in case we miss some.
+  -- TODO: Could probably be smarter and not check those we've 
+  -- already checked though!
+  for k1,v1 in pairs(t1) do
+    local v2 = t2[k1]
+    if( not recursive_compare(v1,v2) ) then return false end
+  end
+  for k2,v2 in pairs(t2) do
+    local v1 = t1[k2]
+    if( not recursive_compare(v1,v2) ) then return false end
+  end
+
+  return true  
+end
+
+function abundant(n)
+   if n==1 then
+      return false
+   end
+   local ff = 1
+   local s=math.floor(math.sqrt(n))
+   if s * s == n then
+      ff = ff + s
+      s = s - 1
+   end
+   for pf = 2,s do
+      if n % pf == 0 then
+         ff = ff + pf + math.floor(n/pf)
+         if ff > n then
+            return true
+         end
+      end
+   end
+   return false
+end
+
+function oddabundant(ct)
+   local n = 1
+   local o = {}
+   while true do
+      if abundant(n) then
+         table.insert(o,n)
+         if #o >= ct then
+            break
+         end
+      end
+      n = n + 2
+   end
+   return o
+end
+
+if recursive_compare(oddabundant(20),{945, 1575, 2205, 2835, 3465,
+                                      4095, 4725, 5355, 5775, 5985,
+                                      6435, 6615, 6825, 7245, 7425,
+                                      7875, 8085, 8415, 8505, 8925})
+then
+   io.write("Pass")
+else
+   io.write("FAIL")
+end
+print("")