#!/usr/bin/env ruby
# Ruby version of a Prime Number Finder
# haplo@mindstab.net

include Math

class Primes
	def findPrimes(cmax)
		3.step(cmax,2) { |i| 
		  max = sqrt(i)
		  isPrime = 1
		  3.step(max, 2) { |x|
		    isPrime = i % x
		    if isPrime == 0
		      break
		    end
		  }
		  if isPrime != 0
		    print i, "\n"
		  end
		}
	end
end


MAX = ARGV[0].to_i;
if ! MAX
	print "primes.rb <MAX NUM>\n"
	exit(1)
elsif MAX < 1
	print "Invalid MAX Input\n"
	exit(1)
end

prime = Primes.new();
prime.findPrimes(MAX);