123456789_123456789_123456789_123456789_123456789_

Class: Integer

Relationships & Source Files
Inherits: Object
Defined in: lib/prime.rb

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Class Method Details

.each_prime(ubound, &block)

Iterates the given block over all prime numbers.

See ::Prime#each for more details.

[ GitHub ] 

  


# File 'lib/prime.rb', line 49



def Integer.each_prime(ubound, &block) # :yields: prime
  Prime.each(ubound, &block)
end


  








  

    .from_prime_division(pd)  
  



  

    

Re-composes a prime factorization and returns the product.



See Prime#int_from_prime_division for more details.


  



  [ GitHub ]


  

  


# File 'lib/prime.rb', line 22



def Integer.from_prime_division(pd)
  Prime.int_from_prime_division(pd)
end


  







Instance Attribute Details



  

    #prime?  ⇒ Boolean  (readonly)
  



  

    

Returns true if self is a prime number, else returns false.


  





  


  [ GitHub ]


  

  


# File 'lib/prime.rb', line 34



def prime?
  return self >= 2 if self <= 3
  return true if self == 5
  return false unless 30.gcd(self) == 1
  (7..Integer.sqrt(self)).step(30) do |p|
    return false if
      self%(p)    == 0 || self%(p+4)  == 0 || self%(p+6)  == 0 || self%(p+10) == 0 ||
      self%(p+12) == 0 || self%(p+16) == 0 || self%(p+22) == 0 || self%(p+24) == 0
  end
  true
end


  







Instance Method Details



  

    #prime_division(generator = Prime::Generator23.new)  
  



  

    

Returns the factorization of self.



See Prime#prime_division for more details.


  



  [ GitHub ]


  

  


# File 'lib/prime.rb', line 29



def prime_division(generator = Prime::Generator23.new)
  Prime.prime_division(self, generator)
end