Pi Pages on the Web
Web pages come and go, but we try to keep the following list up to date. If you find
a link that doesn't work, please let us know
David Blatner, author of The Joy of Pi, wrote a short article about pi for the BBC in England.
The Many Digits of Pi
If you want to download digits of pi, check out these sites:
"The story of pi reflects the most seminal, the most serious and sometimes
the silliest aspects of mathematics." So say Lennart Berggren, Jonathan Borwein
and Peter Borwein in their new book, Pi : A Source Book
. Their Web site offers
comprehensive pi links and meat for the mathematically minded.
Come celebrate National Pi Day (March 14, of course) at the Exploratorium. Find
out how to participate on what is also Einstein's birthday! John Tierney also wrote a nice piece about pi day at The New York Times.
A NASA/JPL scientist explains why even astrophysicists need only 15 digits of pi.
The Web companion to Darren Aronofsky's fascinating film "Pi". You
can also find information and links about the stock market, Kabbalah, migranes, and
a number of other topics relating to the movie. You can also read a short article
about this movie written by Joy of Pi
author, David Blatner, published in
Along with pi fun and facts, you'll also find the binary decimal expansion of
pi. From the binary coding you can also see and hear pi -- a great twist!
Find out what pi approximation day is, and how to celebrate it!
Did you know that 3 + 4/28 - 1/(790 + 5/6) is ia pretty good approximation of pi? Not only that, but it uses all the digits between zero and nine! Check out more cool approximations and submit your own to the contest!
Michael Hartl thinks we should use tau (2pi) instead of pi. Interesting points. He refers also to this article called "Pi is Wrong!"
Articles about Pi Day and Pi
Sasha Volokh of Emory Law School includes fun poems (or piems or pi-ems) for Pi Day.
A fun article about pi day in the Washington Post (focusing on the 2015 "pi day of the century" celebration, but with lots of other good stuff, too).
PBS has a fun review of pi day, with the subtitle: "For the Love of Pi and the Tao of Tau". They added another article with great pi (and pie) images here
Time interviewed Joy of Pi author David Blatner in this short Q&A from 2011
Here's all kinds of fun information compiled by CNN.
A fun article for kids from TIME magazine, including a photo of the author.
How did the theory of pi evolve? Who devoted their lives to calculating digits
of pi? From the Bible to Buffon, this site explores human exploration of the number
The story is told in some depth in The Joy of Pi
, but here's some more
on Indiana's attempts to round up pi.
A short history by Lazarus Mudehwe, with links to the Albany Pi Fan Club
Calculating Pi and Digits of Pi
Here is the formula that allowed David Bailey, Peter Borwein and Simon Plouffe
to compute the ten billioneth digit in the hexadecimal expansion of pi. If you are
"non-technical" there's an explanation for you too!
Want to test your computer's strength? Check here if you want to know more about computing pi. Look for the section entitled, "Special Numbers and Functions" and click on the section for computing pi. A little further down, under "Human Interest" is a section on the Indiana legislatin of pi. More on how to compute here
Pi explorers and authors Bailey and the Borwein brothers offer up an article
"Ramanujan, Modular Equations, and Approximations to Pi or How to Compute One
Billion Digits of Pi" in an effort to follow up on part of Ramanujan's work.
A great description of how to calculate pi based on the Fibonnaci numbers. Background
information and explanations are available.
Pi and Mathematics
A discussion of the Bailey, Borwein Plouffe Algorithm written by Victor Adamchik
and Stan Wagon.
This is a great place to see what questions about pi Dr. Math has fielded in
the past, and to ask any questions about pi that you might have. A great resource
for anyone who wants to know more about pi. You can also check out the Pi FAQ organized
Pi, from Wolfram.
A good look at this classic probability problem and its relationship to pi.
Ilan Vardi asks an interesting question: How can we prove that pi (as a constant) actually exists?
Kevin Knudson explains a fascinating connection between pi, the Wallis formula, and physics (specifically the energy states of the hydrogen atom).
Olle offers up a variety of pi tatoos.
A list of record-holders in the "pi memorization sport."
Antreas P. Hatzipolakis has collected Pi mnemonics from all over the world and
Web (ie. sentences to memorize the first digits of pi) and poems related to pi. A
great place for those who want to join clubs with pi memorization requirements!
As a "loyal member of the Ancient and Honorable Society of Pi Watchers"
Ivars Peterson has written many account of this intrepid number. Here he discusses
ways of memorizing pi.
Fun and weird!
Charles Lucy describes LucyTuning and how pi relates to 'the natural scale of
music,' including references to John "Longitude" Harrison's work on the
Check here to find out how the ancients may have encoded the numeric mysteries
of the pi in the Bible.
Pi and Music
A wonderful composition played on the violin based on mapping the first 200 digits of pi, by Steven Rochen. Watch and listen at youtube.
Lars Erickson's orchestral symphony based on the number pi (some of this was
also used in The Joy of Pi
audio book, published by Random House Audio, available
Felix Jung has created a delightful way to convert the first 10,000 digits of
pi into music using a Flash-based animation.
More Pi Songs at YouTube
There are, of course, many pi tributes on YouTube, including this pi song, this short "pi is exactly three!" excerpt from The Simpsons, this keyboard pi movie, and this awesome rap. And more! Here's Mathematical Pi (sung to American Pie). Another brilliant pi rap.
The inimitable Kate Bush includes a song about pi on her new album Aerial, in which she actually sings 100 or so digits of pi. And it's a good song!
Bill Crozier writes: "As an experiment, I tried in 1980 to get pi to 50
places stuck in my head by writing a song about it. It worked. I can still recite
it now, 20 years later, by singing the song."
Fun with Pi
A very funny spoof on the movies "Pi"
and "American Pie." Caution:
some adult themes. Of course, it's not funny unless you've also seen those movies.
Sound out the depths of your pi knowledge with Eve Andersson's great trivia game.
Do you spend sleepless nights wondering where in pi your birthday or phone number
show up? Wonder no more! Just type in the number sequence and voila! you'll know.
Several people have created pi-inspired images. Here's one link with 3-D imagery, including the cowpi graphic.
Pi Greeting Cards
Send an Internet greeting card for Pi Day (3/14) from 123greetings.com
Buy pi day greeting cards from Greeting Card Universe
For "proof" that pi is rational...a fun, alternative pi resource.
Mike Keith has put together several great literary adventures related to pi,
you can find them here. Plus, Mike shows how to decode pi to see a picture. Check out his cool book here!
Wacky Pi Stuff
Can you imagine 5,942,157 digits of pi on a single poster? You need a magnifying glass to see the numbers, but it's quite amazing.
In case you need a pi T-shirt or a pi hat or a pi mug... Here's some cool pi stuff for sale!
You know you want a silk tie with a pi pattern on it!
Two artists take pi and turn it into art!
Here's a low-tech but high-fun pi ruler that lets you find the circumference or diameter of round objects.
It turns out that pi is critical when making rocking chairs (if you don't want them to fall over)
Pi Fan Clubs
Dedicated to all things pi, this is a wonderful site of links and fun pi stuff. Similarly, check out the German site,
Pi Link Pages
Things to do on Pi Day in School
On pi day (3/14, or March 14), Google changed its site logo. Awesome!
Pi Pages in Other Languages