PrimeGrid’s
Mega Prime Search
On 9 February 2017 08:57:25 UTC, PrimeGrid’s PPS Mega Prime Search project found theMega Prime:3362814
619*2+1
The prime is 1,012,311 digits long and will enter Chris Caldwell's “The Largest Known Primes
rdDatabase” (http://primes.utm.edu/primes) ranked 203 overall.
The discovery was made by Daniel Frużyński of Poland using an Intel(R) Xeon(R) CPU E52670 @ 2.60GHz with 32GB RAM, running Linux. This computer took about 1 hour 49 minutes
to complete the primality test using LLR. Daniel is a member of the BOINC@Poland team.
The prime was verified on 9 February 2017, 09:18:53 UTC by Alen Kecic of Germany using anIntel(R) Core(TM) i7-7700K CPU @ 4.20GHz with 16GB RAM, running Microsoft Windows 10
Professional Edition. This computer took about 56 minutes to complete the primality test using
LLR. Alen is a member of the SETI.Germany team.
Credits for the discovery are as follows:
1.
2.
3.
4.
5.
6.

Daniel Frużyński (Poland), discoverer
PrimeGrid, et al.
Srsieve, sieving program developed by Geoff Reynolds
PSieve, sieving program developed by Ken Brazier and Geoff Reynolds
LLR, primality program developed by Jean Penné
OpenPFGW, a primality program developed by Chris Nash & Jim Fougeron withmaintenance and improvements by Mark Rodenkirch

Entry in "The Largest Known Primes Database" can be found here:
http://primes.utm.edu/primes/page.php?id=122904
OpenPFGW, a primality program developed by Chris Nash & Jim Fougeron, was used to checkfor Fermat Number divisibility (including generalized and extended). For more information about
Fermat and generalized Fermat Number divisors, please see Wilfrid Keller's sites:• http://www.prothsearch.net/fermat.html• http://www.prothsearch.net/GFNfacs.html
Generalized and extended generalized Fermat number divisors are as follows:
Using a single PC would have taken years to find this prime. So this timely discovery would nothave been possible without the thousands of volunteers who contributed their spare CPU
cycles. A special thanks to everyone who contributed their advice and/or computing power tothe search - especially all the sievers who work behind the scenes to make a find like thispossible.
The Mega Prime Search will continue to seek even larger primes. To join the search please visit
PrimeGrid: http://www.primegrid.com

PrimeGrid’s
Mega Prime Search

About PrimeGrid
PrimeGrid is a distributed computing project, developed by Rytis Slatkevičius and currently
administered by Iain Bethune, James Breslin, Scott Brown, Ulrich Fries, Charley Gielkens,Michael Goetz, Roger Karpin, Rytis Slatkevičius, and Van Zimmerman.
PrimeGrid is hosted by Rackspace, and their generous contributions have helped make thisproject possible.
PrimeGrid utilizes BOINC and PRPNet to search for primes with the primary goal of bringing theexcitement of prime finding to the "everyday" computer user. Simply download the software andlet your computer do the rest. Participants can choose from a variety of prime forms to search.
With a little patience, you may find a large or even record breaking prime.
BOINC
The Berkeley Open Infrastructure for Network Computing (BOINC) is a software platform
for distributed computing using volunteered computer resources. It allows users toparticipate in multiple distributed computing projects through a single program. Currently
BOINC is being developed by a team based at the University of California, Berkeley ledby David Anderson.
This platform currently supports projects from biology to math to astronomy. For moreinformation, please visit BOINC: http://boinc.berkeley.edu
PRPNet
PRPNet is a client/server application written by Mark Rodenkirch that is specificallydesigned to help find prime numbers of various forms. It is easily ported between various
OS/hardware combinations. PRPNet does not run each PRP test itself, but relies on
helper programs, such as LLR, PFGW, phrot, wwww, and genefer to do the work.
For more information, please visit PrimeGrid’s PRPNet forum thread:
http://www.primegrid.com/forum_thread.php?id=1215
For more information about PrimeGrid and a complete list of available prime search projects,
please visit: http://www.primegrid.com