Help, our train home is making 9 quintillion stops.

Thanks as always to Jane Street! Here is that blog post about 63-bit numbers.


My book is out in North America on the 21 January 2020. Pre-order now!


Here are the numbers:

9,223,372,036,854,775,798 stops
2^63 = 9,223,372,036,854,775,808
7FFFFFFFFFFFFFF6
111111111111111111111111111111111111111111111111111111111110110

Here are the tweets:

Neil Codling @neilcodling
👀 Help, our train home is making 9 quintillion stops.
EIZrPtbW4AA3UL2.jpeg


Daniel @drawRect
Replying to @neilcodling
Thanks for the tweet. What version of the app are you using? I thought we fixed this bug AGES ago.


Lia Buddle @LiaBuddle
Replying to @neilcodling
Had the same thing in 2017...
EIc4CNJXsAATexO.jpeg


Matt Parker @standupmaths
Thanks everyone who sent me this amazing tweet! So, as always it’s probably a binary overflow problem and sure enough 2^63 = 9,223,372,036,854,775,808 which is close!


We have a free Think Maths magic trick activity that teachers can use to introduce their students to binary.


CORRECTIONS
- None yet, let me know if you spot any mistakes!

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Filming and editing by Alex Genn-Bash
Music by Howard Carter
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MATT PARKER: Stand-up Mathematician
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