is 2 57885161 - 1
has 17425170 decimal digits
takes 122.684 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
Verified Mersenne Prime

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27333.045564.3836 %7100007100002.18201.9284 %35.227565.0704 %
Target27333.045564.3836 %4000006500000012.04574.0763 %45.091265.8354 %
Difference---+310000-64290000-9.8637-2.1479 %-9.8637-0.7650 %

Known prime factors:
None — M57885161 is prime!

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-02-24ANONYMOUS710000710000--2.1821.928%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-23ANONYMOUSv4_computers212532.07000e-5
2000-03-08ANONYMOUSv4_computers212544.15000e-5
2000-06-23ANONYMOUSv4_computers212560.000
2001-09-30ANONYMOUSv4_computers212570.000
2002-12-02ANONYMOUSv4_computers212580.001
2003-09-21Team Prime Ribv4_computers212600.001
2007-07-04abcv4_computers212630.017
2008-10-21ANONYMOUSmosura992632640.032
2009-03-11Sturle Sundegooch.ifi2642650.065
2009-11-28Wolfgang Stegerff-beogate2652660.129
2009-11-28Ungelovendettt2662670.258
2009-11-30Ungelovendettt2672680.516
2011-05-07UngelovendeManual testing2682691.033
2011-05-07UngelovendeManual testing2692702.066
2011-05-07UngelovendeManual testing2702714.131
2011-12-20Tom DuellManual testing2712728.262
2012-10-07Jerry HallettManual testing27227316.52


ECM factoring results:
No ECM results for M57885161


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2013-01-25curtiscwd-210--22l0000000000000000122.7


PRP results:
No PRP results for M57885161


CERT results:
No CERT results for M57885161


P-1 factor-bounds graph:
B1 = 710000 (P-1 stage 1)
104
105
106
104
105
106
TF factor-bounds graph:
273
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270
269
268
267
266
265
264
263
260
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257
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253
this exponent TF target: 73
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00