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	Great Internet Mersenne Prime Search - http://www.mersenne.org/ Online search for Mersenne prime numbers, found largest several primes.
	The Prime Pages - http://primes.utm.edu/ Prof. Chris Caldwell's database of virtually every large or otherwise interesting prime number known; includes the 5,000 largest known prime numbers and records for specific types.
	http://www.loria.fr/~zimmerma/records/ecmnet.html - http://www.loria.fr/~zimmerma/records/ecmnet.html Project to factor numbers using the elliptic curve method. Client and server software.
	distributed.net - http://www.distributed.net/ A distributed computing project currently trying to take the RSA challenge of RC5-64, and also working on OGR-24 and 25 (Optimal Golomb Rulers). Previous projects included CSC and DES.
	Seventeen Or Bust - http://www.seventeenorbust.com A distributed attack on the Sierpinski problem, trying to find the last remaining 17 numbers.

	Ellipsa - Elliptic Curve Primality Proving - http://www.ellipsa.net/ Primo, a primality proving program based on the ECPP algorithm. With Primo one can check crypto-primes and prove whether or not they are actually prime.
	RSA Security - Challenges - http://www.rsa.com/rsalabs/node.asp?id=2091 Monetary prizes for factoring certain large numbers ("RSA Numbers"), as well as breaking RSA and DES encryption schemes; announcements mailing list.
	http://anthony.d.forbes.googlepages.com/mm61.htm - http://anthony.d.forbes.googlepages.com/mm61.htm Attempt at factoring the huge Mersenne number 2^(2^61-1)-1. Software for Windows, DOS and Linux. Work reservation via email.
	Generalized Fermat Primes Search - http://pagesperso-orange.fr/yves.gallot/primes/ Project provides software to search for primes of a specific form. Coordinated via email.
	The Riesel Sieve Project - http://www.rieselsieve.com/ Distributed project to help solve the Riesel problem through the use of donated unused CPU cycles.

	Proth Search Page - http://www.prothsearch.net/ A list of prime number searches using Yves Gallot's proth.exe program, available to download. Maintained by Ray Ballinger.
	Calculating Pi - http://projectpi.sourceforge.net/ Investigates and implements algorithms which may yield to distributed computation of the mathematical constant Pi.
	Goldbach's Conjecture and Factoring the Cryptographic Modulus - http://www.coolissues.com/mathematics/Goldbach/goldbach.htm Algebraic Factoring of the Cryptography Modulus and Proof of Goldbach's Conjecture
	Search for the Largest Proth Prime - http://home.comcast.net/~wfgarnett3/ An internet group to help find the 5th largest prime number, coordinated by William Garnett. Windows/Linux software available.

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