mersenneforum.org Help me understand this result?
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 2020-07-22, 03:11 #1 LOBES   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!
 2020-07-22, 03:53 #2 retina Undefined     "The unspeakable one" Jun 2006 My evil lair 24·383 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).
 2020-07-22, 03:54 #3 Uncwilly 6809 > 6502     """"""""""""""""""" Aug 2003 101×103 Posts 22·53·19 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 2020-07-22 at 04:00
 2020-07-23, 14:28 #4 thyw   Feb 2016 ! North_America 79 Posts Why wouldn't the server assign type 5 prp-cf test? It uses type 5 when there's a factor known... I must be missing something.
 2020-07-23, 14:37 #5 kruoli     "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 PRP-CF, the DC of it will always be with the same type.

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