- PrimeGrid is in the process of verifying a new primorial prime!

All I can reveal is that it is over 250,000 digits in size and is of the -1 form. It proven it will be the first primorial of the -1 form discovered since 1992.

Considering that two new factorial primes were found this year, this has been a banner year for the project.

--Mark - --- In primenumbers@yahoogroups.com,

<mgrogue@...> wrote:

> All I can reveal is that it is over 250,000 digits in size

Congrats on the PRP.

> and is of the -1 form.

The form p#-1 is quite tough to prove, since there are a lot of

gcds to test in the Mihailescu tree. It will be interesting to

see how long it takes with the latest OpenPFGW.

Best regards

David - --- In primenumbers@yahoogroups.com,

"djbroadhurst" <d.broadhurst@...> wrote:

> The form p#-1 is quite tough to prove, since there are a lot of

Congratulations to Michal Gasewicz, whose primorial

> gcds to test in the Mihailescu tree. It will be interesting to

> see how long it takes with the latest OpenPFGW.

form is now in process at the Prime Pages:

http://primes.utm.edu/primes/page.php?id=97061> Description: 843301# - 1

David

> Decimal Digits: 365851

> Submitted: 12/23/2010 10:28:13 CDT

- --- In primenumbers@yahoogroups.com,

"djbroadhurst" <d.broadhurst@...> wrote:

> The form p#-1 is quite tough to prove, since there are a lot of

http://primes.utm.edu/primes/page.php?id=97061

> gcds to test in the Mihailescu tree.

shows that it took 9 days to prove, at the prime pages:

Calling Brillhart-Lehmer-Selfridge with factored part 33.33%

843301#-1 is prime! (828247.1913s+5.2661s)

[Elapsed time: 9.59 days]

David