[QUOTE=kar_bon;543955]9*990^23031-1 was found by Gary on 2019-06-07, see [url='https://www.mersenneforum.org/showpost.php?p=518762&postcount=93']here[/url].
k*b^n-1 was tested there for k<=12, b<=1030 and n<=25k for a different purpose, not CRUS.[/QUOTE]

This is already done to n=100K, see post [URL="https://mersenneforum.org/showpost.php?p=532521&postcount=104"]https://mersenneforum.org/showpost.php?p=532521&postcount=104[/URL] [url=https://betrig.com/betting-tips/]betrig[/url]

also k=b-1 and b+1 done to n=100K, see [URL="https://www.rieselprime.de/ziki/Williams_prime"]https://www.rieselprime.de/ziki/Williams_prime[/URL]

[QUOTE=dannyridel;543936]Really? On [URL="http://www.noprimeleftbehind.net/crus/vstats_new/crus-unproven.htm"]this[/URL] page R990 isn't even existent[/QUOTE]

R990 is complete to n=2500 as shown on the main page. It will not show up on the page that you linked here unless I list all of the k's remaining. I do not list k's remaining unless a base has been tested to n>=10K.

[QUOTE=kar_bon;543955]9*990^23031-1 was found by Gary on 2019-06-07, see [URL="https://www.mersenneforum.org/showpost.php?p=518762&postcount=93"]here[/URL].
k*b^n-1 was tested there for k<=12, b<=1030 and n<=25k for a different purpose, not CRUS.[/QUOTE]

I missed removing that one and showing its prime when Reb reported completion of R990 to n=2500. It is now removed from the sieve file and the prime is shown.

Ian and I have completed S887 to n=300K; no primes were found for n=200K-300K; 2 k's still remain; base released.

S656 tested to n=300k (100-300k)

1 prime found, 6 remain

Results emailed - Base released

Reserving R831 as new base using the new-base script up to 2.5k and sieving to 10k (1G) with srsieve2

S628 tested to n=300k (100-300k)

1 prime found, 7 remain

Results emailed - Base released

Reserving S832 to n=300k (100-300k) for BOINC

[QUOTE=rebirther;544357]Reserving S832 to n=300k (100-300k) for BOINC[/QUOTE]


I'm assuming you mean S837.

R831 tested to n=2.5k + sieved to 1G (2.5-10k)

25415 remain

Results emailed - Base released

Reserving R886 as new base using the new-base script up to 2.5k and sieving to 10k (1G) with srsieve2

R886 tested to n=2.5k + sieved to 1G (2.5-10k)

29469 remain

Results emailed - Base released