R28
 

[URL]http://primes.utm.edu/primes/page.php?id=118945[/URL]

6207*28^430803-1 is prime - R28 is now a 4ker

...blast!...
 

Just so that it is not as much a surprise to anyone ([I]as it was for me[/I]), --
I've got a huge pseudoprime (k=3072, b=81, Sierp.) and in a short time it will be rejected by the UTM server.

I submitted it after running a 16-thread 7-PRP test using mprime, but postmortem will probably show that I put that "PRPBase=7" option in the wrong file (prime.txt? local.txt? I probably remembered wrong into which one I was supposed to put it), and when it returned success, I submitted it to UTM before running the pfgw -t (which is in base 5).

I am running more tests, but it is likely a fluke. It is a very large 3-SPRP though.
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[COLOR="DarkGreen"]EDIT: Or maybe [URL="http://primes.utm.edu/primes/page.php?id=118946"]it is a prime[/URL], after all.[/COLOR]

Added [URL="http://primes.utm.edu/primes/page.php?id=119040"]119040[/URL] : 144*648^186106+1 (523254 digits)

Not the smallest but reprteable :)

Added [URL="http://primes.utm.edu/primes/page.php?id=119053"]119053[/URL] : 43*648^146608-1 (412202 digits)

Lennart

[URL="http://primes.utm.edu/primes/page.php?id=119123"]3147*2^1620488-1[/URL] (=3147*2^202561-1 from R256)

Added [URL="http://primes.utm.edu/primes/page.php?id=119124"]119124[/URL] : 6213*2^1655136-1 (498250 digits)
Another k eliminated from R256 (=6213*256^206892-1).

Sorry, there was a typo.
[QUOTE=unconnected;393052][URL="http://primes.utm.edu/primes/page.php?id=119123"]3147*2^1620488-1[/URL] (=3147*[B]256[/B]^202561-1 from R256)[/QUOTE]

Added [URL="http://primes.utm.edu/primes/page.php?id=119148"]119148[/URL] : 435*2^1853363-1 (557921 digits)
==3480*256^231670-1

One more prime :smile:
Added [URL="http://primes.utm.edu/primes/page.php?id=119151"]119151[/URL] : 3945*2^1894329-1 (570254 digits)
==7890*256^236791-1

Nice run Dmitri! :bow:

R256 is now down to 25 k's remaining. :cool:

one more for vaughan

[URL="http://primes.utm.edu/primes/page.php?id=119314"]82*920^262409 - 1[/URL] (777727 digits)

base is still running in BOINC, decreased to 4k at the moment