20230527, 00:01  #408  
"Gary"
May 2007
Overland Park, KS
10111101110101_{2} Posts 
Quote:
Therefore the removal of even k is not the problem with k=7000000. Perhaps I misunderstood your intent here. 

20230527, 03:55  #409 
"Gary"
May 2007
Overland Park, KS
2F75_{16} Posts 
Serious issue for Riesel base 3:
srbsieve.ini: base=3 mink=43300000 maxk=43400000 c=1 maxNfbncsieve=3 maxKsrsieve2=100000 phase=60 Count of primes for n=1 output by fbncsieve and subsequently written to the pl_prime file: 2993 Actual primes for n=1 as proven by LLR: 1131 Number of composites in pl_prime file for n=1: 1862 The first "prime" in the file has a factor of 7. Based on others comments in this thread, I think it's clear that fbncsieve has serious issues with small primes testing. It needs much standalone parallel testing comparing it to known good software done on its own before being incorporated into other software. See attachments. Last fiddled with by gd_barnes on 20230527 at 03:57 
20230527, 07:02  #410 
"Gary"
May 2007
Overland Park, KS
12,149 Posts 
I wanted to see if the small primes issue popped up for S586 so I ran k = 1 to 10000 to n=60 with maxNfbncsieve=5. It did rear it's ugly head and an unrelated issue came up:
k=1 is showing up in the k's remaining file. It should be in the GFN file. It's interesting that it went to the k's remaining instead of primes file. After all, 1*586^1+1 = 587 is prime. The small primes issue even bit us on a GFN. For the small primes issue: Primes missed: 3*586^1+1 1758*586^5+1 3516*586^3+1 9376*586^2+1 We were lucky enough in this case that all k's were quickly eliminated with somewhat larger primes. Larger primes found: 3*586^6+1 1758*586^6+1 3516*586^7+1 9376*586^8+1 
20230527, 23:25  #411 
Random Account
Aug 2009
Not U. + S.A.
2^{4}×3^{2}×19 Posts 
I will step in this to ask a simple question: Within this environment, is there a way to get srsieve2 to use more than a single thread?

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