And PRPNet port 12001 is here.

Clearly 121 is a square (in fact 11^2, a wonderful Demlo number).

The plus form:

Primes 121*2^n+1 must necessarily have n even. For if n were odd, taken modulo 3, our 121*2^n+1 would be 1*(-1)^n+1=1*(-1)+1=0 (meaning 3 divides our candidate).

Then, with n even, this is actually a generalized Fermat prime B^2+1 with B=11*2^{n/2}.

The first exponents are 8, 12, 44, 84, 96, 228, 264, 320, 732, 788, ....

The minus form:

On the other hand, for 121*2^n-1 to be prime, n must be odd. This can be seen as before, by checking modulo 3. When n is even, beside the factor 3 found in this way, we can also find two huge factors, because B^2-1 = (B-1)*(B+1).

The first exponents are 1, 3, 21, 27, 37, 43, 91, 117, 141, 163, 373, 421, ....

/JeppeSN

If I have an 8 core cpu, how can I get all 8 cores to do work units? Have tried different things and will not work.

Also, have two amd r9 380x, how do I have them do work?

One more thing. My i7-4790k is doing work faster than a e5-2623 v3 cpu, by FAR!! Is that okay? Seems something is wrong here.

this is the master file for the i7-4790k:

// email= is a REQUIRED field. The server will be use this address
// to send you an e-mail when your client discovers a prime.
email=wdethoma@hotmail.com

// userid= is a REQUIRED field that will be used by the server
// to report on stats, etc. without having to reveal the user's
// e-mail address. DO NOT USE spaces. Instead use underscore _.
userid=wdethomas

// This value differentiates clients using the same e-mail ID
// DO NOT USE spaces. Instead use underscore _.
machineid=msi

// This value differentiates instances on a machine
// This will be set automatically by the *-update-prpclient-ini script
// If you prefer to setup up prpclient directories manually, please
// set this to a unique identifier (e.g. 1,2,3,4...)
instanceid=INSTANCE_ID

// Tests completed by this "team" will be rolled-up as part of team stats. This
// will be recorded on tests that are pending and then updated when tests are
// completed. Since it is stored on the server per test, it is possible for a
// single user to be a member of multiple teams. If no value is specified for
// this field, then completed tests and primes will not be awarded to any teams.
// DO NOT USE spaces. Instead use underscore _.
teamid=

// server= configures the mix of work to perform across one or more
// servers. It is parsed as follows:
// <suffix>:<pct>:<workunits>:<server IP>:<port>
//
// <suffix> - a unique suffix for the server. This is used to distinguish
// file names that are created for each configured server.
// <pct> - the percentage of PRP tests to do from the server.
// <workunits> - the number of PRP tests to get from the server. The
// server also has a limit, so the server will never return
// more than its limit.
// <server IP> - the IP address or name for the server
// <port> - the port of the PRPNet server
//
// Setting pct to 0 means that the client will only get work from the
// server if it cannot connect to one of the other configured servers.
// Please read the prpnet_servers.txt in this directory for information
// on the latest PRPNet servers.

// The following servers are from PrimeGrid. To make a server active,
// you must remove the "//". For more information about proper settings
// please see the readme_primegrid.txt in this directory.
// For descriptions of each project, please see this thread:
// http://www.primegrid.com/forum_thread.php?id=1215&nowrap=true#13329
server=121:100:1:prpnet.primegrid.com:12001
//server=FPS:0:1:prpnet.primegrid.com:12002
//server=GCW:0:1:prpnet.primegrid.com:12004
//server=27:0:1:prpnet.primegrid.com:12006
//server=PRS:0:1:prpnet.primegrid.com:12008
//server=WIEFERICH:0:1:prpnet.primegrid.com:13000
//server=WALLSUNSUN:0:1:prpnet.primegrid.com:13001

// This is the name of LLR executable. On Windows, this needs to be
// the LLR console application, not the GUI application. The GUI
// application does not terminate when the PRP test is done.
// On some systems you will need to put a "./" in front of the executable
// name so that it looks in the current directory for it rather than
// in the system path.
// LLR can be downloaded from http://jpenne.free.fr/index2.html
// If running a 64-bit system, comment out the llr.exe and uncomment llr64.exe
//llrexe=llr.exe
llrexe=llr64.exe

// This is the name of the PFGW executable. On Windows, this needs to
// be the PFGW console application, not the GUI application.
// PFGW can be downloaded from http://tech.groups.yahoo.com/group/openpfgw/
// If you are running a 64 bit OS, comment out the pfgw32 line
// and uncomment the pfgw64 line.
//pfgwexe=pfgw32.exe
pfgwexe=pfgw64.exe

// This is the name of the executable used for Wieferich and Wall-Sun-Sun searches.
// Available ONLY to 64bit OS. Uncomment if you have 64bit OS.
// If you have an OpenCL-capable GPU, uncomment 'wwwwcl'
//wwwwexe=wwww.exe
wwwwexe=wwwwcl.exe
//wwwwexe=wwwwcl64.exe

// This sets the CPU affinity for LLR on multi-CPU machines. It defaults to
// -1, which means that LLR can run on an CPU.
cpuaffinity=

// This sets the GPU affinity for CUDA apps on multi-GPU machines. It defaults to
// -1, which means that the CUDA app can run on an GPU.
gpuaffinity=

// Set to 1 to tell PFGW to run in NORMAL priority. It defaults to 0, which means
// that PFGW will run in IDLE priority, the same priority used by LLR, phrot,
// and genefer.
normalpriority=1

// This option is used to default the startup option if the PREVIOUS
// SHUTDOWN LEFT UNCOMPLETED WORKUNITS. If no previous work was left
// this will act like option 9.
// 0 - prompt
// 1 - Return completed work units, abandon the rest, then get more work
// 2 - Return completed work units, abandon the rest, then shut down
// 3 - Return completed, then continue
// 4 - Complete in-progress work units, abandon the rest, then get more work
// 5 - Complete in-progress work units, abandon the rest, then shut down
// 6 - Complete all work units, report them, then shut down
// 7 - Complete all work units then shut down (do not report completed work)
// 9 - Continue from where client left off when it was shut down
startoption=9

// stopoption= tells the client what to do when it is stopped with CTRL-C and there is
// work that has not been completed and returned to the server. Options 2, 5, and 6 will
// return all workunits. This will override stopasapoption. The accepted values are:
// 0 - prompt
// 2 - Return completed work units, abandon the rest, then shut down
// 3 - Return completed work units (keep the rest), then shut down
// 5 - Complete in-progress work units, abandon the rest, report them, then shut down
// 6 - Complete all work units, report them, then shut down
// 7 - Complete all work units then shut down (do not report completed work)
// 9 - Do nothing and shut down (presumes you will restart with startoption=9)
stopoption=9

// stopasapoption= tells the client that it needs to be shutdown automatically, i.e. without
// a CTRL-C. It is evaluated after each test is completed. It should be 0 upon startup.
// The accepted values are:
// 0 - Continue processing work units
// 2 - Return completed work units and abandon the rest
// 3 - Return completed work units (keep the rest)
// 6 - Complete all work units and return them
// 7 - Complete all work units then shut down (do not report completed work)
stopasapoption=0

// Timeout on communications errors
// (default is 60 minutes, minimum is 1 minute if not specified here...)
// Note that the actual used in the client is anywhere from 90% to 110% of this value
errortimeout=1

// Size limit in megabytes for the prpclient.log file...
// 0 means no limit.
// -1 means no log.
loglimit=1

// Set the debug level for the client
// 0 - no debug messages
// 1 - all debug messages
// 2 - output debug messages from socket communication
debuglevel=0

// Whether or not to echo "INFO" messages from server to console for accepted tests
// 0 - no echo
// 1 - echo (default)
echotest=1
____________

If you have 8 core cpu you should click first on the 8-oct-install-prpclient.bat file. This will make 8 folders (1 for each core)

Then you change the master_prpcclient.ini file and include all the information like email and stuff and in the line where [// server= configures the mix of work to perform across one or more] is you should replace that with the exact line
server=121:100:1:prpnet.primegrid.com:12001

when you have saved the master_prpclient.ini file you click on the 8-oct-update-prpclient-ini.bat and that will copy your master ini file to all the folders you made earlier.

When you want to start the prpclient you then click on the 8-oct-start-prpclient.bat and that will start 8 cmd prompts. You can shut down 1 or more if you want to for example just run 7 if you need 1 core to feed your gpu for other program.

Lastly this particular program (the 121 prime search) doesn't have a gpu program so it is cpu only.

Did it now. Thanks

I assume that I need to specify also the 64 bit wu too, correct?
____________

Yeah and uncomment the gpu line if you plan to run gpu prpnet projcet later.

Fingers crossed for that 1 out of 100 🎭

Bummer, rebooted and removed minor over clock.

Bin running boinc for a long, long time on it, just switched over for the challenge. Also no Gpus running. Only thing different was the oc, now removed.

Sorry, I hope this is not a redundant newbie question. I've been participating in PrimeGrid since April, and figured it's time now to turn it up a notch and also install the PRPnet client. What better time to do that, than when the challenge started, right?
But I'm not sure if I have fed PRPNet with the correct information to link to my PrimeGrid account. I followed the instructions, put an underscore instead of space in my username, etc.
The reason why I'm not sure if it works is that I thought the idea was that PRPnet work units would generate credit under the PSA badge. But that doesn't appear to be happening. I can see my username here: http://u-g-f.de/PRPNet/challenge_stats.php as 9th on the list, so I guess my machine is contributing work units properly, but on the list of badges no PSA badge counter has appeared yet (and I didn't have a PSA badge from prior tasks, since I'm only a fairly new member).
Any way to check if the connection between the systems is working as intended?
____________
best regards,
alexander falk

Sorry, I hope this is not a redundant newbie question. I've been participating in PrimeGrid since April, and figured it's time now to turn it up a notch and also install the PRPnet client. What better time to do that, than when the challenge started, right?
But I'm not sure if I have fed PRPNet with the correct information to link to my PrimeGrid account. I followed the instructions, put an underscore instead of space in my username, etc.
The reason why I'm not sure if it works is that I thought the idea was that PRPnet work units would generate credit under the PSA badge. But that doesn't appear to be happening. I can see my username here: http://u-g-f.de/PRPNet/challenge_stats.php as 9th on the list, so I guess my machine is contributing work units properly, but on the list of badges no PSA badge counter has appeared yet (and I didn't have a PSA badge from prior tasks, since I'm only a fairly new member).
Any way to check if the connection between the systems is working as intended?

Homework question (no Admins allowed):
If Prime is found at leading edge given above, what would be its current Prime rank?

I come up with 2,057,941 (on plus side) or 2,057,988 (on minus) digits, which would displace spot #31?

And if from the plus family, it would come in 5th on the GFN list, dwarfed only by the four GFN19 primes (it would be a GFN1 prime as I explained in my June 3 post above). /JeppeSN

Ok so upon discovering the evga memory chips in this computer are not on the "Approved" list, nor the configuration of them I was using. I took the 6700k offline and printed out the approved list. I just came back from microcenter, 258.00 poorer, with "Approved" 4x4 gig sticks of Corsair platinum cmd16gx4m4b3600c18 memory, that have their own fan cooling system with led lighting. 1 for each chip. I jokingly asked about liquid cooling memory, but apparently that's not yet available.
This was the only ones they had in stock on the "Approved" list. I am about to shutdown now and change the memory. The only way I can check after is to run prpnet 12001. I f you want me to wait till after the challenge that's fine with me. But I have no other way to be sure at that point. Kudos to the person who tipped me on "It's usually a memory problem", as this seems to have been the case.