learn the measure of a thing if it can only be measured in prime numbers...

measure.rb

#!/usr/bin/env ruby

require 'prime'

def nth_prime(n)
  pr = Prime.new
  t = 0
  n.times do
    t = pr.next
  end
  return t
end

class MeasureMe

  def initialize( size )
    @size = size
  end

  def measure
    t = 0
    pr = n = 1
    while t < @size
      pr = nth_prime(pr)
      t += 1
      n += 1
    end
    return pr
  end

end

if __FILE__ == $PROGRAM_NAME # only run the following if it's running by itself

  justin = MeasureMe.new( nth_prime(1) * nth_prime(nth_prime(1)) )
  puts justin.measure

end