See you all in Wemding, Germany in 2033 for the next installation of this inevitable maths mistake.

Thanks to everyone involved with Zeitpyramide who were hugely welcoming and accomodating. Official Zeitpyramyde website: http://www.zeitpyramide.de/

Check out Ayliean MacDonald's excellent work on TikTok and indeed YouTube: https://www.tiktok.com/@ayliean/video/7276938427071876385 https://www.youtube.com/@Ayliean

We also had an very helpful German-to-English translator in Benjamin Bungeru who kindly did not translate all of the speeches for me.

Read more about off-by-one errors in my book Humble Pi: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Huge thanks to my Patreon supporters. They lift me up like a 6.5 tonne block. https://www.patreon.com/standupmaths

CORRECTIONS - 01:24 I say "square numbers" when I mean "even square numbers". First corrected by TheSamuelWells - Let me know if you spot anything else!

Filming and editing by Alex Genn-Bash Written and performed by Matt Parker and Ayliean MacDonald Blocky animations by William Marler Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson All clarinet music was recorded live on location.

MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback