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Pastable version of is_prime?

<pre class='prettyprint' language='ruby'>#!/usr/bin/ruby require 'benchmark' include Math GC.disable class Integer def is_prime? i=3 return false if self % 2 == 0 and self != 2 ss = sqrt(self).floor return false if ss**2 == self while i &lt;= ss return false if self % i == 0 i += 2 end return true end end # test it primes = [] puts Benchmark.realtime{(1..100000).each{|x|primes &lt;&lt; x if x.is_prime?}} puts primes.size</pre> <a href="http://www.refactormycode.com/codes/40-is_prime" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>