Riesel Prime Search

Started: 2007-05-28     Last update: 2008-12-17

The "Riesel Prime Search" (RPS) project is searching for primes of the form

k ยท 2n-1 , odd k > 1
which are sometimes called "Riesel primes" (k=1 yields Mersenne primes extensively searched by GIMPS).

RPS is one project on the Top-5000 site of largest primes.

RPS has three subprojects as follows.
(1) high-weight k's that can produce many primes in the given range of exponent n,
(2) low-weight k's that produce a very small number of primes [opposite to (1) above],
(3) small k < 300 (with exception of those k's already reserved by other projects).

The Top-5000 page lists all contributors and all primes reported so far.

RPS was started in October 2005 by people who decided to leave the "15k" project and start a new one.

More details including instruction on how to get started can be found on the Forum at MersenneForum.