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20111213が今年最後の素数日であることの検証

Ruby
prime

Last updated at 2012-12-26Posted at 2012-03-16

lastPrime2011.rb

def isPrime(n)
  2.upto(Math.sqrt(n).to_i) {|i|
    if n%i==0
      return false
    end
  }
  return true
end

20111213.upto(20111231) do |i|
  if isPrime(i)
    puts i
  end
end

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