palindro_prime_ints.rb

require 'prime'

class Integer
    # Monkey patch to check if n is palindromic
    def is_palindrome?
        self.to_s == self.to_s.reverse
    end  
end

# Prints the first n palindromic prime int
n = STDIN.gets.chomp.to_i
puts "#{Prime.lazy.select{|e| e.is_palindrome?}.first(n)}"