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Old 2020-07-22, 03:11   #1
LOBES
 
Mar 2019
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Default 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!
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Old 2020-07-22, 03:53   #2
retina
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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).
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Old 2020-07-22, 03:54   #3
Uncwilly
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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
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Old 2020-07-23, 14:28   #4
thyw
 
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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.
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Old 2020-07-23, 14:37   #5
kruoli
 
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"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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