mersenneforum.org Help me understand this result?
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 2020-07-22, 03:11 #1 LOBES   Mar 2019 USA 228 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 2×32×11×29 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 26×33×5 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 3×23 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 13316 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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