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Pastable version of Euler 14

<pre class='prettyprint' language='ruby'>require 'benchmark' def euler_chain_size(start) length = 0 while start &gt; 1 start = start%2 == 0 ? start/2 : 3*start+1 length += 1 if @chains.has_key?(start) length += @chains[start] break end end length end @chains = {} max_chain_size = 0 max_chain_start = 1 Benchmark.bm do |x| x.report do 1.upto(1000000) do |i| chain_size = euler_chain_size(i) @chains[i] = chain_size if chain_size &gt; max_chain_size max_chain_size = chain_size max_chain_start = i end end end puts &quot;(#{max_chain_start}, #{max_chain_size})&quot; end</pre> <a href="http://www.refactormycode.com/codes/276-euler-14" 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>