Pi is an irrational number, and its sequence is infinite and non-repeating. But there are some cute patterns to be found (as there would be if you look hard enough in any infinitely large number). Feynman thought that if he could memorize pi up to the 762nd decimal place, he could trick people into thinking it was rational and say “999999 and so on and so on …”
Of course, it wouldn’t have fooled Lu Chao, a Chinese man who has memorized pi all the way out to 67,890 digits, according to the World Rankings of Pi Memorization, which is a thing that actually exists.
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