Improved utility files

[project-euler.git] / primes.rb

diff --git a/primes.rb b/primes.rb
index 23fd44737758478dfe7cad13b159755b3f94a9c9..7e2cfaacaa817e2418271d2544961271b0bb245a 100644 (file)
--- a/primes.rb
+++ b/primes.rb
@@ -101,3 +101,11 @@ class Primes
 
 end
 
+
+class Integer
+  @@primes = Primes.instance
+  
+  def prime?
+    @@primes.include? self
+  end
+end