Finding the next prime number online is useful if you do not have time to calculate it but need a good seed for your hash.
export start_number=250000
curl -s "http://www.numberempire.com/primenumbers.php?action=next&number=${start_number}" | sed -n -e 's#.*The smallest prime greater than.*<font color=.*>\(.*\)</font></div></td></tr><tr>.*#\1#p'This can be good the help you finding which number to use when tuning Varnish for better performance with the classic hash algorithm, avoiding bucket collision when having a big number of objects, making hash lookups faster.
