number_to_string.rb

class Integer
  BASE = 95

  def convert_to_string
    num = self
    answer = ""
    while (num > 0)
      num -= 1
      digit = num % BASE
      num /= BASE
      answer = digit_to_char(digit) + answer
    end
    return answer
  end

  private

  def digit_to_char(digit)
    (digit + 32).chr
  end
end

1000.upto(3000) { |x| puts x.convert_to_string }