# The Feynman Point!

Have you ever seen or heard of someone who has memorized a lot of digits of $\pi$? Have you ever tried doing that in your life?

Whatever your answers are, there is another question that is related to all of this: why on earth would anyone want to do that? What is the motivation behind it?

I have a good answer for that.

The Feynman Point.

The Feynman point is a sequence of six $9$'s that begins at the $762$nd decimal place of the decimal representation of $\pi$. It is named after physicist Richard Feynman, who once stated during a lecture he would like to memorize the digits of $\pi$ until that point, so he could recite them and quip "nine nine nine nine nine nine and so on", suggesting, in a tongue-in-cheek manner, that $\pi$ is rational.

I can't speak for anyone else, but to me, that is one of the coolest [if not the coolest] motivations behind memorizing the digits of $\pi$.

So, if you're interested, take out a list containing the first thousand digts of $\pi$ and start memorizing!

Last but not the least, whenever I write something about the digits of $\pi$, I can never resist putting this comic in it. It's funny because it's true!

Alt text

The comic was taken from here.

Note by Mursalin Habib
7 years, 3 months ago

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That's nothing! I remembered ALL the digits of the largest known prime number. Here it goes:

$\large \underbrace{111111111111111111111111111111111111111111111111111 \ldots 1}_{\text{fifty-seven million eight hundred eighty-five thousand one hundred sixty-one } 1 \text{'s} }$

in base 2.

- 7 years, 3 months ago

Show off! :)

For those who don't know what @Pi Han Goh is talking about: there are certain primes that are off the form $2^p-1$ where $p$ is a prime number. These prime numbers are called Mersenne primes. Mersenne primes tend to get really big really fast and it's not hard to see why. In fact the largest known prime number is a Mersenne prime, $2^{57885161}-1$ where $57885161$ is a prime number. And everyone knows that $2^k-1$ is just $k$ $1$'s in binary.

- 7 years, 3 months ago

I saw that on Numberphile he's like "I memorized it all... what's more, in base 2!"

"No wayyyyy that's impossible"

"111111..."

"Oh ok that's hilarious"

- 7 years, 3 months ago

I memorized 130 digits in an afternoon for a pi day competition at my school. The next day I learn that I'm going to seattle for a soccer tournament instead.😫

- 7 years, 3 months ago

I've memorized about 400 digits. I had a really boring math class in fifth grade and I sat next to the giant pi poster my teacher had in her room.

- 7 years, 3 months ago

I remember the value of $\pi$ upto 3.14159265358979, which is because it was mentioned in a movie "Night at the Museum 2"....

- 7 years, 3 months ago

I memorised up to 314 digits for pi day.

- 7 years, 3 months ago

You're too good. I give up...

- 7 years, 3 months ago

That was my first thought too. Do you remember the Einstein bobble-heads in the movie?

- 7 years, 3 months ago

I remember them, but I forgot their significance in the movie..

- 7 years, 3 months ago

I have memorized the whole continued fraction for the most irrational number.. $[1,1,1,1,1,1,....]$. Isn't that much more coooooooool than $\pi$?

- 7 years, 3 months ago

Oh, I have memorized only 41! ♪`~

- 6 years, 1 month ago

@Mursalin Habib, that's a great note. But would you tell me how did you make the Wikipedia article look like that? (I mean the formatting & the code you used)

- 7 years, 3 months ago