title: Display sequential post number / count (not id) instead of "posted on date" - Wordpress
body: <p>I'm creating a "150 energy tips" website, and I would like to number each post with unique number but I just don't have the skills to do it.
  Then, I would display numbers instead of date so if I have 150 posts published on the site I should see <code>tip n° x" (x=1,2,3,4...149,150)</code> on each.
  It doesn't matter if the oldest published post is 1 or 150, random numbers are good as well.</p>