288*13^109217-1 is prime!!!

This proves that 302 is the lowest Riesel k for base 13.

BTW, it was found with Phil Carmody's phrot program on PPC and proved with PFGW.

Reserving Sierp. base 6 k=10107, k=13215, and k=14505 for LLRnet I6. :smile:

On Sierp base 9, JapelPrime reported that he is at n=210K.

On Sierp base 19, I am now at n=8600. From n=7550-8600, 88 more k's were removed. 1709 k's still remain. Continuing to n=10K.

Curtis has reported that Riesel base 28 k=5076 is now complete to n=25K; no primes. He is unreserving the k. The base is now completely available.

Base 28 has 7 good k's for testing; 4 of which have only been tested to n=25K and 1 other to n=50K.

Reserving Sierp base 16 k=2908, 6663, and 10183. I'll take them to n=150K. These k's are not included in the 1st drive.

I want to get all powers-of-2 bases k-values tested to at least n=500K base 2 with the exception of base 256. Drive 1 is already there, drive 2 is almost there. Remaining are these 3 k's and a few k's on the even-n and odd-n Riesel and Sierp conjectures, which are in progress.


Gary

Those who work on this project, might be interested in the following thread:

[url]http://www.mersenneforum.org/showthread.php?p=130779#post130779[/url]

Riesel base 6 status
 

k=1597: still at n=155k
k=9577: n=74k
the remaining 14 k's at n=48.6k

Riesel base 6
 

pfgw -q"58757*6^49122-1" -f0 -tp
Primality testing 58757*6^49122-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 13, base 1+sqrt(13)
Calling Brillhart-Lehmer-Selfridge with factored part 61.31%
58757*6^49122-1 is prime! (268.1372s+0.0164s)

16,000 candidates less to test. 15 k's to go!

Micha reported that all k's on Riesel base 31 are complete to n=61.6K. No more primes found.

Base 19 riesel update
 

Hi everyone,

Here are my current results on the base 19 riesel conjecture. With pfgw I discoverd 4920 k's that have no prime under n < 2000.
I've sieved with srsieve, tested with LLR and found 3030 PRPs for different k. All prps under 17,000 have been confirmed prime with pfgw. My minimum n is 17,000, as it creeps higher I'll confirm the PRPs.

Having fun, Willem.