factoids about the number 37.
http://www.thirtyseven.org/

think of something that comes in threes and contribute it, as part of an attempt to create a book with the most authors ever.
http://www.threes.com/

book by David Blatner, telling the story of pi and humankind's fascination with it, from Archimedes to the modern day Chudnovsky brothers.
http://www.joyofpi.com/

seeds a pseudorandom number generator with the 7 way SHA1 cryptographic hash of a digitization of a chaotic system: the digital picture of 6 Lava Lite Lamps.
http://www.lavarnd.org/

resources for prime numbers including history, primality proving theorems, list of record primes, software, and more.
http://primes.utm.edu/

true random number service with CORBA and WWW interfaces. Numbers are generated with atmospheric noise.
http://www.random.org/

instant, customizable, random sampling and assignment. Throw your random number tables away!
http://www.randomizer.org/

looks at the relationship between the golden proportion and aesthetics.
http://goldenmeangauge.co.uk/

claims a relationship between various universal identification systems and 666.
http://www.adsx.net/

A tutorial that models fractions with number lines or circles.
http://www.visualfractions.com/

the definition of pi, pi jokes, some digits, and links.
http://www.wpdpi.com/

a concise look at the strangest number in the universe, by Charles Seife.
http://www.zerothebook.com/
