pi
π = 3.
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When I was in high school, we had some fun activities for the students that included stuff like spelling competitions. One of my math teachers decided to host a "pi spelling" contest there, where we'd have to recite as many digits of pi from memory as we could. I later learned this is a common competition and there's even a federation for it! Back in high school, I memorized 384 digits (I remember this because the 382nd to 384th digits form the number 384) and won the competition.
I don't have any interest in seriously competing on this or in learning the actual memorization techniques people use. My technique is just to break it down into blocks of 8 digits (like phone numbers in Brazil and birth dates, which I always liked memorizing). I like to think about the numbers and not much else.
I want to have easy access to the digits in this format, so I thought I might as well have it on my website.
PS: This is not really a useful skill, but I find it a nice time killer to repeat digits in my brain when I'm waiting for something without other forms of entertainment, or even when I'm listening to some painful speech and want to send my brain anywhere else.