Version history: How to find the number of Friday the 13ths in a given year

  1. #2008-08-07: first version on my old website
  2. #2009-03-23: added the "another way" section
  3. (2013-12-24 – 2015-10-07: a few minor changes)
  4. #2023-01-13: first version on; added a couple paragraphs at the top for context, added a comment section, and made a few other changes to make it work with the rest of the site