Hey guys, I got bored and decided to create a script that generates pi to arbitrary precision. I know lua already has math.pi, but I got bored! Anyways, it uses an infinite product series. Here:

len = 2^20 --this sets precision. Anything higher slows the script down.
a = {}
b = {}
for j=2,len do a[j]=2*math.floor(j/2) end --generate a series of even numbers in table a
for k=2,len do b[k]=(2*math.floor(k/2))+1 end --generate a series of odd numbers in table b
pie = 1
for i=2,len do pie=pie*(a[i]*b[i-1]) pi=pie*2 end
The result is stored in variable pi. Note that to calculate pi again, you must reset variable "pie" to 1.

EDIT: It seems I've pasted the wrong code. When I tested one, it worked, but I think I pasted this one differently. It doesn't work. Please ignore...