add ruby

	@ time -f "%C : %E seconds" ./prime.py 100000 > /dev/null

	@ time -f "%C : %E seconds" ./prime.lua 100000 > /dev/null

	@ time -f "%C : %E seconds" ./prime.php 100000 > /dev/null

	@ time -f "%C : %E seconds" ./prime.rb 100000 > /dev/null

#!/usr/bin/env ruby

def isPrime(num)

  num_sqr = Math.sqrt(num)

  return false if num_sqr % 1 == 0

  (2..num_sqr.to_i).each do |n|

    return false if num % n == 0

  end

  return true

end

primes = []

i = 2

while primes.count < ARGV.first.to_i do

  primes << i if isPrime(i)

  i += 1

end

puts primes