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require 'prime'
class Integer
  def primorial
    Prime.each(self).inject(1, :*)
  end
end
p [0, 1, 3, 4, 5, 21].map {|i| [i, i.primorial]}

Success #stdin #stdout 0s 28344KB

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Standard input is empty

stdout

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[[0, 1], [1, 1], [3, 6], [4, 6], [5, 30], [21, 9699690]]

https://ideone.com/ccP7e9

language:

Ruby (ruby 2.5.5)

created:

visibility:

secret

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