class
Prime
v1_8_7_72 -
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- Superclass: Object
No documentation available for this class.
Included modules
- Enumerable
Files
- lib/mathn.rb
1Note
Cheking if a number is prime?
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?