Gist Solution - https://gist.github.com/4067114

first_commit_solution.rb

class Fixnum
  def prime?
    (2..Math.sqrt(self).to_i).each do |number|
     return false if (self % number == 0)
   end
   true
 end
end

class PrimeMatrix

  def initialize(size = 10)
    @matrixSize = size
  end
  
  def axis
    @axis = @axis || generateAxis
  end
  
  def generateAxis
    number = 2
    axis = []
    until (axis.size == @matrixSize) do
        axis.push(number)  if number.prime?
        number = number + 1
    end
    axis
  end
  
  def calculate
    (0...@matrixSize).each do |i|
      Printer.draw(MatrixLine.new(i, axis).calculate)
    end
  end
end


class MatrixLine
  def initialize(line, primersLine)
    @line = line
    @primers = primersLine
  end
  
  def calculate
    factor = @primers[@line]
    @primers.map {|i| i * factor}
  end
  
end

class Printer
  def self.draw(line)
    line.each do |elements|
      print "#{elements} |"
    end
    print "\n"
  end
end

PrimeMatrix.new(10).calculate