Proof-code: L436
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  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 4)
Entrance Rank (*):mean 37.00 (minimum 37, maximum 37)

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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:

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 0.021% of the (active) primes and 0.007% of the (active) score for this program.
Entry last modified:2017-10-20 16:50:13