Proof-code: L447

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 L447, one of those codes.

Code name (*):L447   (See the descriptive data below.)
Persons (*):1 (counting humans only)
Projects (*):1 (counting projects only)
Display (HTML):Kohlman, Gcwsieve, MultiSieve, PrimeGrid, LLR
Number of primes:total 1
Unverified Primes:0 (prime table entries marked 'Composite','Untested', or 'InProcess'
Score for Primes (*):total 45.5941, on current list 45.5941 (normalized score 2)
Entrance Rank (*):mean 25.00 (minimum 25, maximum 25)

Descriptive Data: (report abuse)

On 13 Aug 2007, 1:42:08 UTC, PrimeGrid's Woodall Prime Search found the 32nd and largest known to date Woodall prime.

The discovery was made by Stephen Kohlman of Canada using an Intel C2D 6300 @ 1.86 GHz with 1 GB RAM. This computer took a little over 5 hours and 41 minutes to test using the LLR program. Stephen is a member of Team Canada.

The prime was verified on 20 Aug 2007, 2:40:57 UTC, by Jeff Morales of the United States using an Intel Pentium 4 @ 2.8 GHz with 512 MB RAM. This computer took a little over 10 hours 27 minutes to test using the LLR program. Jeff is a member of team SETI.USA.

This is PrimeGrid's second Woodall prime. Since the search began, just under 85,000 tests have been completed by 2555 users using over 5100 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, Lennart Vogel, Joseph M. Osiecki, Geoffrey Reynolds, and Paul Underwood.

Additional thanks to all the sievers who prepared the work for PrimeGrid: Sievers

PrimeGrid's Woodall Prime Search will continue to search for even larger Woodall Primes. To join the search please visit PrimeGrid:

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Below is additional information about this entry.

Display (text):Kohlman, Gcwsieve, MultiSieve, PrimeGrid, LLR
Display (short):Kohlman
Database id:3358 (do not use this database id, it is subject to change)
Proof program:LLR  The primes from this code accounts for 0.021% of the (active) primes and 0.002% of the (active) score for this program.
Entry last modified:2024-07-15 20:37:09
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