The Wagstaff formula seems correct when comparing those results with the reported length of Wagstaff PRPs on [URL="http://www.primenumbers.net/prptop/searchform.php?form=%282%5En%2B1%29%2F3&action=Search"]PRPTop[/URL]

[QUOTE=MischaR;629482]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:
[CODE]
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[/CODE][/QUOTE]

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

[QUOTE=MischaR;629495]The Wagstaff formula seems correct when comparing those results with the reported length of Wagstaff PRPs on [URL="http://www.primenumbers.net/prptop/searchform.php?form=%282%5En%2B1%29%2F3&action=Search"]PRPTop[/URL][/QUOTE]

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

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

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:
[CODE]
alter table Candidate drop column HasSierpinskiRieselPrime;
alter table CandidateGroupStats drop column SierpinskiRieselPrime;
alter table CandidateGroupStats add column SierpinskiRieselPrimeN int default 0;[/CODE]

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.

[QUOTE=Happy5214;633563]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.[/QUOTE]

attached the prpnet server compiled with vs2019

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:

[code]
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.
[/code]