This troper's brother likes to do this.

This troper unintentionally memorized the first 70 digits of pi by listening to the song "Pi" by Hard 'n Phirm.

I did it the other way around. I listened to the song a lot in hopes to actually learn some of pi, going so far as to make it my ringtone. It worked.

{{Medinoc}} is not one of those Pi geeks, but still remembers two alexandrines from a French poem French piphilology (hey, I learned a new word today!), enough to get 14 decimal places: Count the letters! #QUOTE#Que j'aime à faire apprendre un nombre utile aux sages ! #QUOTE#Immortel Archimède, artiste ingénieur...

For me, it's the sentence ''Sám u sebe v hlavě magického pí­ čí­slic deset mám'' (approximately translated into English as: "I by myself in (my) head (of the) magical pi have digits ten", but then it no longer works.)

{{Micah}} had a friend in college who decided that memorizing digits of pi wasn't geeky enough for him, so he memorized hexadigits of pi instead.

BlackHumor knows that you can fake as much of pi as you want as long as you know more of it than the person you're talking to and you're good at making up random numbers. I'm good at the first but not the second, alas.

This troper (125 digits, below) has once met someone who really did know more than he did (128 digits, when I had 100). There have also been several would-be fakers.

This Troper never learned Pi beyond 5 places, but will always remember that 100/51 is approximately 1.960784317225.

''This'' troper never bothered learning any more than the 40 or so digits necessary to calculate the circumference of a circle the size of the entire universe accurate to the width of an atom, and can't even remember beyond 3.1415926535 now. The few "pi=3" biblical literalists who aren't straw men have it easy. Until they actually need to work with circle geometry and trig functions, which might not be often.

I was bored in seventh grade. I've still got 50 digits stuck in my head.

Three words: Sho Minamimoto cosplayer.

This troper learned pi as far as 3.14125926535823846264338 just because of him.

Don't you mean 3.14159265358979323846264?

This troper can manage as far as 3.141592654, because that's as far as her calculator showed it.

When This troper was in high school calculus, my class was given the entire semester to memorize as many places as possible, for one extra credit point each. I got to twenty-five, but these days ten is about as much as I can rattle off. Maybe twelve on a good day.

This troper got bored enough to memorise it off her calculator once. As the above troper says, it only shows ten digits. I switched to Fibornacci instead, which was useless since you can just work out the numbers in the sequence as necessary, but killed some time.

I had, for the longest time, thought that it went 3.1415927 because I forgot that the calculator would round up the last digit.

This troper has a friend in grade seven who plans to learn 3141 digits of pi by March fourteenth, or 3/14, pi day. She is already over one thousand, recited over about 3 and a half minutes

But rounded off at three digits past the decimal, it would be 3.14''2''...

This troper went as far as 3.141592653589793238462 with the aid of... music. Really. Consider 1=C, 2=D, 3=E and so on and play the obtained melody (which is not bad, I must say) with any instrument and memorize that. As long as you can hum the music, you'll remember the digits!

This Troper memorized 72 digits. After memorizing most of it, he changed his favorite number to e. He's also memorized other things, such as the first 16 powers of 2.

Most programmers (this one included) memorize powers of two, simply because they are used so much.

I always found 3.14159265 to be good enough for me. Sometimes, I even use it as a synonym for the edible kind of pie.

This troper has memorized 125 decimal places, most of them during a couple of very boring math classes. 3.1415926535897932384626433 8327950288419716939937510 5820974944592307816406286 2089986280348253421170679 8214808651328230664709384... Next to which, his 15 digits of ''e'' (2.718281828459045) look rather pathetic.

This troper knows 142 digits of pi, but only 3 digits of e. (Numbers after the above are 46095505822317258)

Does being able to derive one or more formulae to calculate an arbitrary number of digits of pi count as knowing an infinite number of digits? In the case of e, this is even easier, as it has a particularly simple formula.

It counts if and only if you can evaluate the formula, to arbitrary precision, quickly enough to give the illusion of having the digits memorized. Good luck!

This troper's school liked to have "Sidewalk Chalk day" about once a term. They would leave a few buckets of chalk out and, as long as you weren't obscene about it, you could draw pretty much as you pleased. During her senior year, a student (Civil Engineer, she later found) used his computer's MAPLE to calculate out Pi to the 6642nd digit. He then proceeded to write, in the middle of the quad, *School name* is as easy as 3.1415926535 etc., all over campus, in a continuous line. This happened in the fall, in the spring he did so with e, going off a balcony, down a wall, and terminating in the middle of the street with chalk marks used to imply he was hit by a car.

THAT...IS...AWESOME.

This troper memorized 200 digits for a contest in her seventh-grade math class. It was something of a CrowningMomentOfAwesome, since her classmates had been making fun of her for constantly reciting it to herself during the period of preparation, only to be utterly thrashed in the actual contest. One student actually yelled "Holy crap!" several digits in. The trick: memorizing it in groups of ten digits. These days I can only remember 35 or so. 3. 1415926535 8979323846 2643383279 5028841971...

Pi is just a matter of historical accident and odd notation. Real geeks memorize digits of 2* pi (which is actually a more fundamental constant)

Sort of played by Da_Nuke who, on account of having taken digital electronics, knows by heart the first 17 powers of two: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4092, 8196, 16372, 32768, 65536.

{{Medinoc}} does too, and used to assume everybody in the computer science sector knew that. And by the way, it's 409'''6''', 819'''2''' and 163'''84'''.

This troper's friend called to wish her a happy Pi Day (March 14th, aka 3.14). She then went on to say that a former sorority sister of hers had been a math major and had chosen the day as her wedding day. The ceremony was to start at exactly one minute to two in the afternoon. In other words, 3.14 1:59. It's the most deliciously dorky thing this troper has heard in a long time.

This troper had a friend who did something similar but instead went by military time holding the wedding at exactly 4:32 PM March 14th (3/14 16:32 or with creative adjustment... 3/14 15:92).

Pi=3.1415926535897932384626433832795... And that's as far as This Troper can get without looking it up.

This Tropette had to memorize Pi for a task in a big school competition. That task was given at 10 PM, and the time it would be held was given as "when the Organization asks" - a.k.a., anytime. She kept reciting them - around 160 digits - until 4 PM, they called her at 5 PM, she won it, yey!

This Troper memorized about 150 digits for a Pi Day contest, and ended up winning third place. The first place winner memorized 314 digits, intentionally to correspond with pi's beginning. These days This Troper only remembers fifty or so digits though.

When This Troper's math teacher needs some random digits for a sample problem, he'll often plug in the first nine or so digits of pi.

This Troper has got as far as 42 digits (3.141592653589793238462643383279502884197169...) - it wasn't anything to do with TheHitchhikersGuideToTheGalaxy, honest. The calculator in Windows XP can get the first 46 digits right, but then it starts to suffer rounding problems.

Quite honestly, my math team friends and I are geeks. How do we know? We argued over the 100th digit of pi and recited as far as we knew pi between one another as we waited for the bus to take us to a competition.

This Troper's school celebrates Pi Day, despite being in the UK where the whole 3.14 date thing makes no sense at all. The winner memorised over 300 digits. My friend memorised 100. I inevitably feel slightly inferior whenever I enter a maths classroom.

This troper's middle school had a Pi Day event for seventh and eighth graders. Since sixth graders couldn't participate, her sixth-grade math teacher let the class recite pi as far as they could if they wanted, and this troper blew everyone away with at least 40 more digits than the guy in second place.

This Troper was so bored in secondary school he memorized pi to a hundred places over the course of several lunchtimes. And can still crack 50 even today.

This troper memorized pi = 3.1415926535897932384626433832795 when he was in 4th grade, and has since added six digits (832795). Considering learning some more, too.

Pi = 3.14159265358979323846264. Thank you, KateBush.

This troper has only memorised Pi to nine places and e to seven, but has memorised the first twenty powers of two and the first four negative powers of two in decimal form. Need I say the powers of two come in very useful? 0.0625, 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 512288, 1048576.

It's 524288.

This troper is rubbish at remembering pi (generally getting as far as 3.141592), but is quite good at remembering ''e'' because of the pattern in the first 15 decimal digits: 2.7'''1'''8''2''8'''1'''8''2''8'''45'''90'''45'''. Of course, the pattern breaks down after that because e is transcendental, but...

This troper heard a mnemonic for remembering e back in high school, in case anyone is interested:

Here are '''2''' facts about AndrewJackson:

He was the '''7'''th president of the United States.

He was elected in '''1828'''.

That's so important, I'll mention it twice: '''1828'''.

The angles of a right isosceles triangle are '''45'''-'''90'''-'''45'''.

Not many math mnemonics help with U.S. history class as well, which increases the usefulness.

This troper had 30-40 digits memorized back in grade school, but can now only recite the first 25 reliably...the decrepitudes of age.

This troper knows pi to 82 decimal places - memorized the first 60 (which is how many digits his father knows) in 8th grade, intended to memorize it up to 100, but has never gotten around to finishing it. As for powers of two, he's memorized nearly all of them up to 2^32 (still haven't got 2^28 or 2^29).

This geeky troper subverts this trope in that all of her nongeek friends automatically think she can rattle off Pi digits because she is a Math major when in fact she only knows 3.14 and relies on a calculator for anything beyond that.

I'm also a maths major that doesn't know any more digits than I need to. People that deliberately learn off the digits of pi to a large amount of decimal places grate on me a tiny bit just because of how pointless and quasigeeky it is. Of course it's all in good fun and I'm just a bit of a grump.

This troper has a geeky math obsessed cousin with a tattoo of the first hundred or so digits of pi wrapped around his leg in a spiral. Luckily the tattoo artist was just as nerdy as him and made sure to get all the digits right.

This troper never bothered to learn pi past the 31 digits (which somehow ''still'' manages to be unusual - there are a lot of mathematically small ponds) in the mnemonic (probably found in one of Martin Gardner's columns or books): #QUOTE#Sir, I send a rhyme excelling #QUOTE#in sacred truth and rigid spelling. #QUOTE#Numerical sprites elucidate #QUOTE#for me the lexicon's full weight; #QUOTE#If nature gain, who can complain, #QUOTE#Tho' Dr. Johnson fulminate?

This troper memorized 100 (really 96) digits back in 7th grade and used the 3. + 96 digits as a password for email. 25 seconds baby... Still knows those 100 for sure and an additional 100 is iffy. e is easy for the first few... Phi is also neat. In fact, natural constants (pi, e, phi) tend to be nicer to memorize than artificial constants (sqrt(2), sqrt(3)) for some reason...

The digits of pi are arbitrary, depending on the base; continued fraction expansions are much more mathematically interesting. This troper will always remember 355/113, which is accurate to 8 decimal places - which comes from pi = 3+1/(7+1/(15+1/(1+1/(292+1/(1+.... . Stopping early gives 22/7, or 333/106.

This Troper knows the value of pi, off by heart, to a relatively modest ten decimal places (3.1415926535). Justified in that this troper is only fifteen years old. However, it's certainly handy to know when you're lacking a scientific calculator and have to settle with a four-function for maths lessons.

This troper has memorized the 300 first decimals through the last week, and plans to memorize at least a few hundred more. His friends say he'll never, EVER need this knowledge, but who knows...

This troper seems to have memorised the most here: 520 digits and counting.

5419351/1725033, anyone?

3.14159265358979323846264338327950288419716939937510... ad infinitum.

This troper memorized Pi to 272 digits, sung to Mozart's Eine Kleine Nachtmusik. She blew away most of the competition at that year's Pi Day contests, where there's an award for most digits and most creative recitation. Won the most creative recitation, came in second to most digits.

As a Mozart fan and the one at [[strike:767]] 1000 decimals below, this troper thinks this deserves the top spot in the GeekyTurnOn article.

This troper memorized around 116 digits-- some multiple of four, anyway-- and still knows most of them. Somewhat justified in that her entire geometry class seemed to be doing it, she just got the furthest.

This troper, several years ago, knew 400. I now remember only exactly half of that.

This troper has just memorized the decimals up to the Feynman Point, or the 767 first decimals. Which is still not enough for him, as he's going for 1000.

1000 decimal places were reached yesterday, at last. This troper has gotten enough for now.

This troper read that LewisCarroll had used a mnemonic system of his own invention to memorise 71 decimal places of ''pi'', and so decided to one-up him by memorising the first 72 without any mnemonic aids -- and I still know them all.

This troper learned the first 30 digits by a song, and then just got another three somewhere else. 3.14159265358979323846264338327950...

This troper's 8th grade math class had a big poster with pi on it. She stared at it whenever she was bored, and by the end of the year, she knew pi up to the 60th digit. Sadly, she's forgotten most of it by now.

Oddly enough, this troper, who is a mathematician, only knows pi to 11 decimal places.

A room in this troper's old high school had (has?) as many digits of pi above its chalkboards that will fit there in a rather large font. Sadly, this troper only remembered pi as 3.14159 until he read this page and, promptly, got "tongue-tied" when he tried to type that out, originally typing "3.1519" and, then, manage to type it as "3.14i59" and leave it for a few days.

3.14159265358979... not sure why I memorized that far and no more, but it's more than I'll ever need.

The StarWarsCustomizableCardGame has a card called, "Brainiac" with a destiny value of pi. On the card, pi is listed to 27 digits. This troper memorized the digits from the card, and then added a few more to get to a round 40 digits: 3.141592653589793238462643383 27950 28841 971...

This troper know Pi to 24 or so decimal places, his best friend knows it to 60 and an English teacher of his supposedly knew it to 125.

This troper is a real mathematician and so knows that trying to learn the expansion of an irrational number in an arbitrary base (why not do it in binary; at least that's slightly fundamental) is a pointless exercise. Rather, he knows that true knowledge of pi means knowing various ways of generating the number to any degree of accuracy required a priori, and knowing the precise logical foundation of these methods. 4 times the sum from 0 to infinity of (-1)^n/(2n+1), anybody? :) He also wonders why if people are so concerned about being accurate to all practical scales involving circles, they don't ever seem to know the expansions of various just-as-common numbers such as e, ln2, sqrt2, or sqrt3, beyond a few digits.

A Real Mathematician is someone who, when he sees the hallway on fire and a fire hose nearby, exclaims "Aha, a solution exists!" and then goes back to bed.

This troper memorized pi to 200 digits back in high school -- which was in the early 1980s. (His main source for the digits? A photo of a chalkboard in the 1976 ''Guinness Book of World Records'', which listed the world record for most memorized digits of pi at a paltry 3,125.) Those digits are still in his head, ready to be recited at a moment's notice.

I've only gotten up to 100 - as in, exactly 100. I group them in my head as follows: 3.14159265 3589 793238 46264 33 8 32795 0288 41971 69399 37510 58209 74944 59230 78164 0628 6 20899 86280348 25342117 0679.

3.14159265358979323846264338327 is what I memorized.

When this troper was bored at work back in 1996 he memorized pi in a poem form that he saw on a web page. To this day he can recite: 3.14159; 2653589; 7932384; 626 and a whole lot more.

3.14. That's all you need for any calculation you're doing in your head. You need to be more precise, you go look it up. Heck, for rough estimates I go with just 3.