class

Prime

Ruby latest stable (v1_8_6_287) - 1 note - Superclass: Object

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lib/mathn.rb

August 15, 2008

4 thanks

It’s a class for generating an enumerator for prime numbers and traversing over them.

It’s really slow and will be replaced in ruby 1.9 with a faster one.

Note: if you just want to test whether a number is prime or not, you can use this piece of code:

  class Fixnum
    def prime?
      ('1' * self) !~ /^1?$|^(11+?)\1+$/
    end
  end

  10.prime?