20200722, 03:11  #1 
Mar 2019
USA
3·17 Posts 
Help me understand this result?
This was assigned to me (as opposed to me getting it manually). I'm having trouble understanding the results:
https://www.mersenne.org/report_expo...ll=1&ecmhist=1 1. If it has been Factored, why is my result, and the one before mine, saying its a probable prime? 2. Why is the residue "PRP_PRP_PRP_PRP_"? That doesn't seem right? Granted, I'm not very knowledgeable on the subject, I just like to Trial Factor mostly. Thanks! 
20200722, 03:53  #2 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
2^{4}·383 Posts 
The number had three known small factors.
So you were assigned the task to determine if the remainder is also a prime. And your result shows it is a prime with good probability, so the remainder is PRP, a probable prime. Therefore that number is now fully factored (if you assume the PRP result is a real prime). 
20200722, 03:54  #3 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2^{2}·5^{3}·19 Posts 
The remaining cofactor is a Probable Prime.
There are 3 factors listed. What is left after those are divide out looks to be a prime. Rejoice as this is fully factored now. https://www.mersenne.ca/exponent/3307 Here is the remaining cofactor Code:
4353524133827611408574208775478589622111831317341613312984483361937010301205675662770047321087657048773241272664969392649718635926074520045281026910770712314524181933285227032125890659729016386069176693616914507334697422980860732777622339397522425721336605336658097363439448188753603624197638404803872825913098432275237874692169933508441748813480413682045289248409103532867732796807798694178375216208599640289769681995273685523060799468166287838493578146083048523489321729004640944722830982540726315520246334782951056660779801812979132998107387817802450037638989678012221564659671646755919013676548232993387587588481088712201127163199334146273445861473198777280904858096693010663932570520300269384917851688798854877340668001753453962945664051594771519075317923436346650061743281400127677733596528217642970792987250908618113230982353461817488308071861173968794875263418257665630917664743895435713 Last fiddled with by Uncwilly on 20200722 at 04:00 
20200723, 14:28  #4 
Feb 2016
! North_America
79 Posts 
Why wouldn't the server assign type 5 prpcf test? It uses type 5 when there's a factor known...
I must be missing something. 
20200723, 14:37  #5 
"Oliver"
Sep 2017
Porta Westfalica, DE
2·241 Posts 
"Older" Versions of Prime95 default to type 1. The newer ones doesn't. And if there is a PRPCF, the DC of it will always be with the same type.

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