Confirmed by pfgw:
4001*28^56146-1 is a probable prime. Time: 1318.830 sec.
Please credit George Woltman's PRP for this result!

Tralala, Willem.

Sierp base 12 k=404 is complete to n=100K. No primes. Now unreserved.

Sierp base 6 k=10107, 13215, and 14505 are complete to n=60K. No primes. Now unreserved. Sieved file links up to n=100K are on the reservations web page.


Gary

I'm reserving the remaining base 30 Riesel values for 25k < n < 100k

659 (25K)
774 (25K)
1024 (25K)
1580 (25K)
1642 (25K)
1873 (25K)
1936 (25K)
2293 (25K)
2538 (25K)
2916 (25K)
3253 (25K)
3256 (25K)
3719 (25K)
4372 (25K)
4897 (25K)

[quote=rogue;125336]I'm reserving the remaining base 30 Riesel values for 25k < n < 100k
[/quote]


Great! Welcome to the effort Rogue.


Gary

After a draft of 10k n’s without primes, there are two in a row:

83988*31^41706-1 is prime
111038*31^42197-1 is prime

Jippee:smile:

That leaves 11 candidates on Riesel 31
(26064 candidates to test upto 100k)

Riesel base 30 k=225, 239, 249 only testing to n=50k forgot to say how far I was going when I reserved these.

Riesel Base 30 k=225, 239, 249 tested to n=50k No Primes found, releasing these. Results e-mailed, let me know if you got them.

base 16 k=443 complete to 550k base 2 (~135k base 16). LLR in progress 550-650k and 650k-up. I have sieved to 1.2M fully, and started a sieve from 1.2M to 3M (750k base 16).

I *will* defeat this k.

5076 base 28 finally in progress, should be complete tomorrow sometime to 25k, no further reservations. Apologies for the delay.
-Curtis

[quote=VBCurtis;126311]base 16 k=443 complete to 550k base 2 (~135k base 16). LLR in progress 550-650k and 650k-up. I have sieved to 1.2M fully, and started a sieve from 1.2M to 3M (750k base 16).

I *will* defeat this k.

5076 base 28 finally in progress, should be complete tomorrow sometime to 25k, no further reservations. Apologies for the delay.
-Curtis[/quote]

Thanks for the update Curtis. Interestingly a multiple of k=443, that is k=7088, is one of 51 k's remaining for Riesel base 256 (all remaining searched to at least n=20K, i.e. n=160K base 2).

If you can find a prime for k=443 where n==(4 mod 8), that eliminates the equivalent of k=443 in 3 different bases at once. Good luck with THAT! :smile:


Gary

Status update
 

Hi everyone,

First of all: Thank you Gary for tracking all this! Your webpage make this obscure corner of the prime world easy to track.

I've finished some of my range, alas without primes:
233*28^n-1 100000
1422*28^n-1 100000

1611*22^n+1 200000
588*30^n+1 100000
278*30^n+1 100000

I still have (32 || 65 || 155) *26^n+1, it is at 95219 now. It stalled because other people keep using that PC. Maybe this week I'll clean up.

My project on k*19^n-1:
With PFGW I found ca 5000 k's remaining after taking n until 2000.
With srsieve and LLR I've taken these to n = 5700. I now have 2200 k's remaining.
Currently I am planning to take them to 25k. That's going to take two months or more.

Having fun, Willem.

10 k's left for Riesel 31 now:

131240*31^46714-1 is prime!