Version history: How to find the number of Friday the 13ths in a given year
chridd
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Math
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Friday 13ths
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Version history
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2008-08-07: first version on my old website
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2009-03-23: added the "another way" section
(2013-12-24 – 2015-10-07: a few minor changes)
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2023-01-13: first version on chridd.nfshost.com; 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