Mathemagic
ISBN: 0806983558
Buy on Amazon
Found in 1 comment on Hacker News
localhost · 2021-11-30 · Original thread
When I was a kid, I loved the Mathemagic book [1] IIRC this was one of the tricks described in the book.

[1] https://www.amazon.com/Mathemagic-Raymond-Blum/dp/0806983558

Fresh book recommendations delivered straight to your inbox every Thursday.