Funneling in Java hashing
<p>I read in <a href="http://www.cris.com/~ttwang/tech/hashsize.htm" rel="nofollow">an article which says</a>:</p>

<blockquote>
  <p>It is a common practice to recommend a prime number to be the size of a hash table. This way, a funnel will occur only if the keys are multiples of the prime number.</p>
</blockquote>

<p>Here, why should a prime number be used for the initial size, and what is funnelling?</p>
