Samuel Yates began, and this site continues, a database of the largest known primes. Primes in that database are assigned a proof-code to show who should be credited with the discovery as well as what programs and projects they used. (Discoverers have one prover-entry, but may have many proof-codes because they use a variety of programs...) This page provides data on L436, one of those codes.
Code name (* ):L436 (See the descriptive data below.) Persons (* ):1 (counting humans only) Projects (* ):1 (counting projects only) Display (HTML) :Andersen2 , Gcwsieve , MultiSieve , PrimeGrid , LLR Number of primes :total 1 Unverified Primes :0 (prime table entries marked 'Composite','Untested', or 'InProcess') Score for Primes (* ):total 45.0970, on current list 45.0970 (normalized score 88) Entrance Rank (* ):mean 37.00 (minimum 37, maximum 37)
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Descriptive Data:
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The discovery was made by Lasse Mejling Andersen of Denmark
using an Intel Celeron 2.80 GHz with 512 MB RAM. This
machine took a little over 3 hours and 27 minutes to test
using the LLR program. The prime was verified on 7 Aug
2007, 15:25:07 UTC, by Mike Ingram using an Intel Pentium D
3.2 GHz with 2 GB RAM. This machine took a little over 2
hours 52 minutes to test using the LLR program.
This is PrimeGrid's first Woodall prime. Just under 65000
tests were completed by 1332 users using over 2700
computers.
Using a single PC would have taken years to find this
prime. So this timely discovery would not have been
possible without the hundreds of volunteers who contributed
their spare CPU cycles. A special thanks to everyone who
contributed their advice and/or computing power to the
search - especially Brian Rodenkirk, Joseph M. Osiecki,
Geoffrey Reynolds, and Paul Underwood.
PrimeGrid's Woodall Prime Search will continue to search
for even larger Woodall Primes. To join the search please
visit: PrimeGrid: www.primegrid.com
Below is additional information about this entry.
Display (text): Andersen2, Gcwsieve, MultiSieve, PrimeGrid, LLR Display (short): Andersen2 Database id: 3337 (do not use this database id, it is subject to change) Proof program: LLR The primes from this code accounts for 0.024% of the (active) primes and 0.289% of the (active) score for this program.Entry last modified: 2009-11-22 05:50:12
