20210228, 08:47  #485 
Feb 2021
1 Posts 
powmod via script gives me incorrect results when it starts using Generic modular reduction. I was learning using script en scriptify and started by making a Mersenne Prime script. It first checks the candidates by powmod base 3 and when it is successful it runs a complete test. It finds all the Mersenne primes up to 607 but for p>=647 modular reduction is used and incorrect results are generated. Is this a known bug or am I doing something wrong?

20210425, 01:27  #486 
Sep 2002
Database er0rr
3^{2}×19×23 Posts 
The repunit function "r()" prints a lot of extranious spaces after the number.
For example: Code:
./pfgw64 f0 od q"r(5794777)"  wc PFGW Version 4.0.1.64BIT.20191203.x86_Dev [GWNUM 29.8] No factoring at all, not even trivial division 1 2 5794826 Last fiddled with by paulunderwood on 20210425 at 01:29 
20210425, 02:00  #487 
Einyen
Dec 2003
Denmark
C7B_{16} Posts 
This works, it gives a file with 5794777 1's:
Code:
./pfgw64 f0 od q"r(5794777)"  tail c +13  head c 5794777 > rep5794777.txt 
20211018, 09:43  #488 
Jun 2009
2^{2}·173 Posts 
help needed
Dear all,
Norman Luhn (Cybertronic) and I are trying to prove the following number using PFGW: (520461*2^55931+1)*(43439253939*(520461*2^559311)^23)+1 there is a file helper.txt which contains 520461*2^55931+1 2584831267 The command we are using is pfgw tc l hhelper.txt <inputfile> I tried the following PFGW versions: Linux Version 3.8.3 64bit Linux Version 3.7.8 64bit Windows 4.0.0/1 64bit (Help  About says 4.0.0, onscreen it says 4.0.1) Windows 3.6.5 32bit and 64bit All tests run on Intel CPUs They all gave me "is prime" with an output that looks like this: Code:
Primality testing (520461*2^55931+1)*(43439253939*(520461*2^559311)^23)+1 [N1/N+1, BrillhartLehmerSelfridge] Running N1 test using base 5 Running N1 test using base 13 Running N+1 test using discriminant 29, base 3+sqrt(29) Calling N1 BLS with factored part 33.33% and helper 0.02% (100.01% proof) (520461*2^55931+1)*(43439253939*(520461*2^559311)^23)+1 is prime! (236.0713s+0.0011s) We tried to determine what's going on but we can't pinpoint the issue. I have no AMD, he has no Intel machines. Could some people please try and post PFG Version, CPU, OS and result? this test only takes a few minutes to run. Thanks a lot Peter 
20211018, 09:57  #489 
Jan 2007
Germany
2×11×19 Posts 
Additions:
I get also on a Laptop SONY Vaio Intel processor "FermatLucasPRP" PFGW Versions: Very old up to V4.0 32/64bit OS Windows 10 / Windows 7 command line pfgw2 tc hxyz cs Output: OS Windows 10 , Ryzen 7 1700 3GHz Z:\PFGW>pfgw2 tc hxyz cs PFGW Version 1.2.0 for Windows [FFT v23.8] ***WARNING! file cs may have already been fully processed. Primality testing (520461*2^55931+1)*(43439253939*(520461*2^559311)^23)+1 [N1/N+1, BrillhartLehmerSelfridg Reading factors from helper file xyz Running N1 test using base 5 Running N1 test using base 13 Running N+1 test using discriminant 29, base 3+sqrt(29) Calling N+1 BLS with factored part 0.02% and helper 0.00% (0.07% proof) (520461*2^55931+1)*(43439253939*(520461*2^559311)^23)+1 is Fermat and Lucas PRP! (903.1017s+0.0100s) xyz: numbers 520461*2^55931+1 2584831267 
20211018, 10:18  #490 
"Oliver"
Sep 2017
Porta Westfalica, DE
7·109 Posts 
Code:
PuzzlePeter: Calling N1 BLS with factored part 33.33% and helper 0.02% (100.01% proof) Cybertronic: Calling N+1 BLS with factored part 0.02% and helper 0.00% (0.07% proof) 
20211018, 10:39  #491 
Sep 2002
Database er0rr
3^{2}×19×23 Posts 

20211018, 10:47  #492 
Jan 2007
Germany
2·11·19 Posts 
Only this two lines
520461*2^55931+1 2584831267 
20211018, 10:57  #493 
Sep 2002
Database er0rr
3^{2}·19·23 Posts 
One thing to try: rename "xyz" to "helper" and run with hhelper

20211018, 11:00  #494 
Jan 2007
Germany
2·11·19 Posts 
Okay, I will try hhelper
Other files in use was hhelper.txt , without success 
20211018, 11:08  #495 
Jun 2003
5,179 Posts 
Code:
~/Desktop/pfgw_linux_4.0.1/distribution$ ./pfgw64 tc l hhelper.txt input.txt PFGW Version 4.0.1.64BIT.20191203.x86_Dev [GWNUM 29.8] Output logging to file pfgw.out Primality testing (520461*2^55931+1)*(43439253939*(520461*2^559311)^23)+1 [N1/N+1, BrillhartLehmerSelfridge] Reading factors from helper file helper.txt Running N1 test using base 5 Running N1 test using base 13 Running N+1 test using discriminant 29, base 3+sqrt(29) (520461*2^55931+1)*(43439253939*(520461*2^559311)^23)+1 is prime! (294.1606s+0.0005s) ~/Desktop/pfgw_linux_4.0.1/distribution$ uname a Linux R5 5.4.088generic #99Ubuntu SMP Thu Sep 23 17:29:00 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux ~/Desktop/pfgw_linux_4.0.1/distribution$ lsb_release a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal ~/Desktop/pfgw_linux_4.0.1/distribution$ lscpu Model name: AMD Ryzen 5 3600 6Core Processor 
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