I have problem with PFGW

khudothitaymo · 2018-10-26, 01:41

can any one help me how to use PFGW to find factorial primes example: 3507!-1

How can i sieve for them, (are there any other utilities).
If you can please give a detailed reply.

Batalov · 2018-10-26, 01:46

Are using Windows or linux?
"!" especially in Windows can be misinterpreted.

Put the candidate in a file, and then test without any problems.
You can use the shortcut in command-line as well.

Code:

pfgw64s -N -k -f -l -q'3507!-1'
3507!-1 is 3-PRP! (2.0993s+0.1825s)

pfgw64s -N -k -f -l -tp -q'3507!-1'
Primality testing 3507!-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 3511, base 1+sqrt(3511)
3507!-1 is prime! (7.3174s+0.0018s)

What seems to be the problem?

axn · 2018-10-26, 02:37

I won't answer the question that was asked, but will answer the question that should've been asked. Please coordinate with PrimeGrid, as they are already doing search on Factorial primes (http://www.primegrid.com/forum_thread.php?id=3008)

rogue · 2018-10-26, 13:29

Quote:

Originally Posted by khudothitaymo

can any one help me how to use PFGW to find factorial primes example: 3507!-1

How can i sieve for them, (are there any other utilities).
If you can please give a detailed reply.

For factorials and multi-factorials, use mfsieve, which is built upon the mtsieve framework.

Nevertheless, PrimeGrid is testing factorials. Here is their current status: http://prpnet.primegrid.com:12002/

2018-10-26, 01:41	#1
khudothitaymo Oct 2018 2 Posts	I have problem with PFGW can any one help me how to use PFGW to find factorial primes example: 3507!-1 How can i sieve for them, (are there any other utilities). If you can please give a detailed reply.

2018-10-26, 01:46	#2
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 2516₁₆ Posts	Are using Windows or linux? "!" especially in Windows can be misinterpreted. Put the candidate in a file, and then test without any problems. You can use the shortcut in command-line as well. Code: pfgw64s -N -k -f -l -q'3507!-1' 3507!-1 is 3-PRP! (2.0993s+0.1825s) pfgw64s -N -k -f -l -tp -q'3507!-1' Primality testing 3507!-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 3511, base 1+sqrt(3511) 3507!-1 is prime! (7.3174s+0.0018s) What seems to be the problem?

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2018-10-26, 02:37	#3
axn Jun 2003 2·3·7·11² Posts	I won't answer the question that was asked, but will answer the question that should've been asked. Please coordinate with PrimeGrid, as they are already doing search on Factorial primes (http://www.primegrid.com/forum_thread.php?id=3008)