Class: Fixnum

Inherits:
Object
  • Object
show all
Defined in:
lib/is_prime.rb

Instance Method Summary collapse

Instance Method Details

#prime? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/is_prime.rb', line 2

def prime?
  self < 2 ? false : ('1' * self) !~ /^1?$|^(11+?)\1+$/
end