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Message: [QUOTE="Ryan Leavengood, post: 4495142"] Well I coded this up. Instead of pasting my whole solution I'll just paste the cache class and the updated "main" block for my solution. I've also added some timing code so one can see the speed improvements. To try this out, replace my if $0 =3D=3D __FILE__ code from my original solution with all of the following: class WeirdCache def initialize(filename=3D'.weirdcache') @filename =3D filename if test(?e, filename) @numbers =3D IO.readlines(filename).map do |i| i.chomp.to_i end else @numbers=3D[] end @added =3D false end def each(&block) @numbers.each(&block) end def <<(i) @added =3D true @numbers << i end def save if @added File.open(@filename, File::RDWR|File::CREAT|File::TRUNC) do |file| file.puts @numbers end end end end if $0 =3D=3D __FILE__ if ARGV.length < 1 puts "Usage: #$0 <upper limit>" exit(1) end puts "Weird numbers up to and including #{ARGV[0]}:" start =3D Time.now cache =3D WeirdCache.new at_exit {cache.save} limit =3D ARGV[0].to_i i =3D 69 cache.each do |i| if i <=3D limit puts i end end (i+1).upto(limit) do |j| if j.weird? cache << j puts j end end puts "This took #{Time.now - start} seconds" end [/QUOTE]