Thanks as always to Jane Street! Here is that blog post about 63bit numbers.
https://blog.janestreet.com/whatisg...
My book is out in North America on the 21 January 2020. Preorder now!
http://bit.ly/humblepi
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
/ 1190757074164170758
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.
/ 1191033767760158720
Lia Buddle @LiaBuddle
Replying to @neilcodling
Had the same thing in 2017...
EIc4CNJXsAATexO.jpeg
/ 1190982241914101760
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!
/ 1190940255974760448
We have a free Think Maths magic trick activity that teachers can use to introduce their students to binary.
http://thinkmaths.co.uk/standupmaths...
CORRECTIONS
None yet, let me know if you spot any mistakes!
Thanks again, as always, for Jane Street being my principal sponsor.
https://www.janestreet.com/
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MATT PARKER: Standup Mathematician
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