- ECMNET - Project to factor numbers using the elliptic curve method. Client and server software.
- Generalized Fermat Primes Search - Project provides software to search for primes of a specific form. Coordinated via email.
- The Prime Pages - 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.
- MM61 - Attempt at factoring the huge Mersenne number 2^(2^61-1)-1. Software for Windows, DOS and Linux. Work reservation via email.
- Goldbach's Conjecture and Factoring the Cryptographic Modulus - Algebraic Factoring of the Cryptography Modulus and Proof of Goldbach's Conjecture
- Search for the Largest Proth Prime - An internet group to help find the 5th largest prime number, coordinated by William Garnett. Windows/Linux software available.
- Ellipsa - Elliptic Curve Primality Proving - 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.
- Great Internet Mersenne Prime Search - Online search for Mersenne prime numbers, found largest several primes.
- Seventeen Or Bust - A distributed attack on the Sierpinski problem, trying to find the last remaining 17 numbers.
- The Riesel Sieve Project - Distributed project to help solve the Riesel problem through the use of donated unused CPU cycles.
- The Prime Sierpinski Problem - Mathematical project to find the smallest prime Sierpinski number.
- Calculating Pi - Investigates and implements algorithms which may yield to distributed computation of the mathematical constant Pi.
- 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.
- RSA Security - Challenges - Monetary prizes for factoring certain large numbers ("RSA Numbers"), as well as breaking RSA and DES encryption schemes; announcements mailing list.
- Electronic Frontier Foundation - Cash prizes for discovery of very large prime numbers through Cooperative Computing Awards program.
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