mscroggs.co.uk
mscroggs.co.uk

subscribe

Blog

Archive

Show me a random blog post
 2019 
 2018 
 2017 
 2016 
 2015 
 2014 
 2013 
 2012 

Tags

aperiodical big internet math-off golden ratio harriss spiral the aperiodical chebyshev game of life palindromes fractals propositional calculus martin gardner manchester noughts and crosses trigonometry books games game show probability countdown python machine learning tennis dataset nine men's morris mathslogicbot draughts graph theory dragon curves go craft sound pac-man arithmetic approximation manchester science festival estimation reuleaux polygons gerry anderson national lottery flexagons folding paper dates triangles hexapawn football speed cross stitch frobel accuracy hats chalkdust magazine golden spiral royal baby sorting pizza cutting puzzles realhats error bars sport wool rugby london news london underground captain scarlet rhombicuboctahedron christmas card programming weather station folding tube maps statistics bubble bobble pythagoras a gamut of games people maths php menace final fantasy map projections logic light video games ternary polynomials data mathsteroids javascript curvature european cup electromagnetic field braiding misleading statistics interpolation inline code raspberry pi matt parker radio 4 chess probability coins world cup platonic solids plastic ratio asteroids twitter geometry binary christmas oeis latex bodmas stickers reddit

Archive

Show me a random blog post
▼ show ▼
 2016-10-06 
Thanks to Marc, I noticed that today's date is a palindrome in two different date formats—DMMYY (61016) and DMMYYYY (6102016).
This made me wonder when there will be another date that is palindromic in multiple date formats, so I wrote a Python script to find out.
Turns out there's not too long to wait: 10 July 2017 will be palindromic in two date formats (MDDYY and MDDYYYY). But before that, there's 1 July 2017, which is palindromic in three date formats (YYMMD, YYMD and MDYY). Most exciting of all, however, is 2 February 2020, which is palindromic in 7 different formats!
The next palindromic dates are shown in the following table. It will update as the dates pass.
 \(n\) Next day with \(\geq n\) palindromic formatsFormats
11 September 2019YYMMD,YYMD,MDYY
21 September 2019YYMMD,YYMD,MDYY
31 September 2019YYMMD,YYMD,MDYY
42 February 2020YYYYMMDD,DDMMYYYY,MMDDYYYY,YYYYMDD,YYMDD,DDMYY,MMDYY
52 February 2020YYYYMMDD,DDMMYYYY,MMDDYYYY,YYYYMDD,YYMDD,DDMYY,MMDYY
62 February 2020YYYYMMDD,DDMMYYYY,MMDDYYYY,YYYYMDD,YYMDD,DDMYY,MMDYY
72 February 2020YYYYMMDD,DDMMYYYY,MMDDYYYY,YYYYMDD,YYMDD,DDMYY,MMDYY
A full list of future palindromic dates can be found here.

Similar posts

Dragon curves II
Logical contradictions
Dragon curves
How OEISbot works

Comments

Comments in green were written by me. Comments in blue were not written by me.
 Add a Comment 


I will only use your email address to reply to your comment (if a reply is needed).

Allowed HTML tags: <br> <a> <small> <b> <i> <s> <sup> <sub> <u> <spoiler> <ul> <ol> <li>
To prove you are not a spam bot, please type "r" then "a" then "t" then "i" then "o" in the box below (case sensitive):
© Matthew Scroggs 2019