1177711

gistfile1.rb

require 'bigdecimal'
require 'bigdecimal/math'
include BigMath

buffer = ''

class String
  def palindrome?
    self == self.reverse
  end
  
end

require 'mathn'

PI(100_000).to_s.each_char do |char|
  buffer << char
  if buffer.size == 7
    if buffer.palindrome? 
      p "found palindrome #{buffer}"
      if buffer.to_i.prime?
        p "found answer #{buffer}"
        break        
      end
    end
    buffer = ''
  end
end