Factoring database

[kar_bon]

Originally Posted by Stargate38

Also, Please fix the "Maximum of 2 parallel processing requests".

It's for people like you filling the FactorDB with useless numbers:

from your thread in the RPS forum asking for primes of Riesel-k=8675309 you're testing them like this.

Stop that please and use srsieve for sieving and LLR for finding primes instead.
Thanks.

[Stargate38]

I will stop if I can get NewPGen to accept b=8675310 in k*b^n+1 WITHOUT crashing! I want to add the primes I find to the DB! Please increase the hourly CPU limit to 1 hour.

[firejuggler]

8675309*12^21+1
8675309*12^965+1
8675309*12^3733+1
those are the first 3 i found

[kar_bon]

Originally Posted by Stargate38

b=8675310 in k*b^n+1

Do you know, how fast this will grow in n?
Do you know how much digits the FactorDB can handle?

And:
for your RPS-request:
8675309*2^n-1 is prime for n=4, 40, 84, 212, 720, 1512, 9344, 44160 (tested to n=50k),
done in 15min: 5min sieving and 10min LLR-testing, this you're not able to do with only FactorDB.

[Stargate38]

I'm trying to find a Generalized Fermat Prime base 8675310. Can you tell me why NewPGen crashes when I try to sieve b^2^n+k for k=1 n=1-14 and b=8675310? 8675310^16384+1 has 113677 digits, so it's not too big to test. Why would it make NewPGen crash? How do I fix it? (See attached image on Post 1328 of this thread)

[axn]

Originally Posted by Stargate38

Why would it make NewPGen crash? How do I fix it?

What is your OS version? What is the version of NewPGen you're using? What are the sequence of actions leading up to the crash? What, if any, error message is shown on the screen during the crash?

[Stargate38]

Windows 7 Home Premium 64-bit; NewPGen 2.8.2; See the "C166 from 10^455-1" thread, post #41. I pick a name for the output file (for example: 8675310^n+1), then I set it for b^n+k with k fixed, then I set k=1, base=8675310, nmin=2, nmax=16384, and click start. It outputs the following:

CPU capabillities: CMOV: Cupported. SSE2: Supported.
Using bitmap : allocating 2.0 Kb of RAM...
...succeeded
Sieving numbers with 14 to 113677 decimal digits
k is tiny : 8675310^2+1 = 75261003596101
Initialising sieve...
Done.
10:42:00 Starting sieve

After that, NewPGen crashes with the following windows message:

NewPGen has stopped working
 
Windows can check online for a solution to the problem.

Here are the error details:

Problem signature:
Problem Event Name: APPCRASH
Application Name: newpgen.exe
Application Version: 0.2.8.2
Application Timestamp: 4003d0b0
Fault Module Name: newpgen.exe
Fault Module Version: 0.2.8.2
Fault Module Timestamp: 4003d0b0
Exception Code: c0000005
Exception Offset: 00012546
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789
Read our privacy statement online:
http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409
If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt

[smh]

Try a filename without a ^

[Stargate38]

I tried 8675310n1, 8675310nplus1, 86753101, and GFN8675310, but none of them worked. I even tried 1234567891. What else could cause the error?

[axn]

Originally Posted by Stargate38

I tried 8675310n1, 8675310nplus1, 86753101, and GFN8675310, but none of them worked. I even tried 1234567891. What else could cause the error?

If you have DEP (Data Execution Prevention) enabled, add NewPGen.exe to the exception list.

[Stargate38]

It didn't say anything about DEP. Normally DEP shows a message saying "This program was shut down to protect your system" or something like that.