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Versailles : 6km (41/80m) Done !

Monte-Cristo : 18km (111/203m)

Fontainebleau : 75km (271/365m)

Breteuil : 25km (196/203m)

Vincennes : 22km (57/177m)

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