PRPNet 5.5 Released

[MischaR]

The Wagstaff formula seems correct when comparing those results with the reported length of Wagstaff PRPs on PRPTop

[rogue]

Originally Posted by MischaR

I think the DecimalLength calculator for Carol-Kynea is incorrect. The formula used is:
floor(log10(base) * (n * 2) / 3 + 1)

But I think it should be
floor(log10(base) * (n * 2) + 1)

Few examples:

sum                 used formula  suggested formula  actual length
(10^123-1)^2-2      83            247                246
(10^1061+1)^2-2     708           2123               2123
(60^11307+1)^2-2    13404         40212              40212
(290^124116-1)^2-2  203749        611246             611246

I have no idea where the / 3.0 came from in the code. I will let you know when it is fixed.

[Happy5214]

Originally Posted by MischaR

The Wagstaff formula seems correct when comparing those results with the reported length of Wagstaff PRPs on PRPTop

By my math, Wagstaff should be floor(log10(doubleB) * doubleN - log10(3.0) + 1.0); (that's where the 3 comes into play).

On this subject, is there any way you (rogue) can move the heavily repeated floor call and addition by 1.0 out of the switch statement so it's only in the code once? You can use the return 0.0; line as a default clause.

[unconnected]

For those who are migrating from 5.4.3 to 5.5 version (as I am) and don't want to start from scratch here are simple sql queries to adjust DB structure:

alter table Candidate drop column HasSierpinskiRieselPrime;
alter table CandidateGroupStats drop column SierpinskiRieselPrime;
alter table CandidateGroupStats add column SierpinskiRieselPrimeN int default 0;

[Happy5214]

I need a Windows build that includes revision 113 (with the fix for llr2's round-off errors). I recently switched my computers to llr2, and now my one Windows computer has PRPNet crashing on a test with round-off errors.

[rebirther]

Originally Posted by Happy5214

I need a Windows build that includes revision 113 (with the fix for llr2's round-off errors). I recently switched my computers to llr2, and now my one Windows computer has PRPNet crashing on a test with round-off errors.

attached the prpnet server compiled with vs2019

[rogue]

I have updated the executable for PRPNet to 5.5.2 over at sourceforge. Here are the changes for 5.5.1 and 5.5.2:

Version 5.5.2:  July 3, 2023 - New Release
    prpclient:  Avoid infinite loop if unable to connect to server.

Version 5.5.1:  April 28, 2023 - New Release
    prpserver:  Added showteamsonhtml configuration switch to control HTML generation.
                Fix length calculation for Carol/Kynea servers.
                Added all_primes.html page which can be sorted per prpserver.ini configuration.
                Add support a new gcwsieve output format.
                Give error if ids have an embedded ? as the ODBC driver on the server
                doesn't like it.
    prpclient:  If connection to server is lost while sending results, retry if any
                results where successfully submitted.
                Change text as roundoff errors with llr2 can put "probable prime" on a
                line that doesn't have a reside.
                Fix check for ? in id fields.
                Reconnect to server if connection was lost.