Prime
Prime numbers and factorization library.
Installation
Add this line to your application's Gemfile:
gem 'prime'And then execute:
$ bundle
Or install it yourself as:
$ gem install prime
Usage
require 'prime'
# Prime is the set of all prime numbers, and it is Enumerable.
Prime.take(4) #=> [2, 3, 5, 7]
Prime.first(4) #=> [2, 3, 5, 7]
Prime.each(7).to_a #=> [2, 3, 5, 7]
# Determining whether an arbitrary integer is a prime number
Prime.prime?(7) #=> true
8.prime? #=> false
# Factorization in prime numbers
Prime.prime_division(8959) #=> [[17, 2], [31, 1]]
Prime.int_from_prime_division([[17, 2], [31, 1]]) #=> 8959
17**2 * 31 #=> 8959Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/prime.
License
The gem is available as open source under the terms of the BSD-2-Clause.