Merge branch 'master' into branch-for-challenge-173-python

2 files changed, 47 insertions, 0 deletions

diff --git a/challenge-173/deadmarshal/lua/ch-1.lua b/challenge-173/deadmarshal/lua/ch-1.lua
new file mode 100644
index 0000000000..c25a62fb47
--- /dev/null
+++ b/challenge-173/deadmarshal/lua/ch-1.lua
@@ -0,0 +1,23 @@
+if #arg ~= 1 then
+   io.stderr:write('No args provided!')
+   os.exit(1)
+end
+
+local function is_esthetic_number(n)
+   assert(type(n) == 'number', 'n must be a number!')
+   local function uabs(a, b)
+      if a < b then return b - a else return a - b end
+   end
+   if n == 0 then return false end
+   local i = n % 10
+   n = n // 10
+   while n > 0 do
+      local j = n % 10
+      if uabs(i, j) ~= 1 then return false end
+      n = n // 10
+      i = j
+   end
+   return true
+end
+
+print(is_esthetic_number(tonumber(arg[1])))
diff --git a/challenge-173/deadmarshal/lua/ch-2.lua b/challenge-173/deadmarshal/lua/ch-2.lua
new file mode 100644
index 0000000000..1cca518763
--- /dev/null
+++ b/challenge-173/deadmarshal/lua/ch-2.lua
@@ -0,0 +1,24 @@
+-- https://github.com/edubart/lua-bint
+-- To install this library: luarocks install bint
+local bint = require 'bint'(1024)
+
+local function product(t, last)
+   assert(type(t) == 'table' and
+	  type(last) == 'number',
+	  't, last must be table, number, number respectively!')
+   local prod = bint(1)
+   for i=1, last do prod = prod * t[i] end
+   return prod
+end
+
+local function sylvesters_sequence()
+   local t = {2,3}
+   while(#t ~= 10) do
+      t[#t+1] = bint(product(t, #t) + 1)
+   end
+   return t
+end
+
+local t = sylvesters_sequence()
+for i=1, #t do print(t[i]) end
+