The Mystery of 355/113 (2010)
22/7 has you memorize four digits (including the position of the /) to get pi to four digits (including the position of the .), 355/113 has you memorize seven digits to get pi to eight digits, 355/113-1/3748629 has you memorize 17 digits to get pi to 16 digits. I don’t get it. How is it easier than just memorizing pi? How is it surprising to get out about as many bits as you put in?