is 2 82642081 - 1
has 24877746 decimal digits
takes 257.883 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L2DFFB3537A835B__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27592.590964.0000%730000144175006.67733.8600%99.268265.3896%1.3896%
PrimeNet2715.784961.9718%340000160000005.39895.2676%11.183863.9750%2.0032%
GPU7227592.590964.0000%550000180000006.79033.8903%99.381365.4005%1.4005%
Difference---+180000-3582500-0.1131-0.0303%-0.1131-0.0109%-0.0109%

Known prime factors:
No known factors for M82642081

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2017-08-17T18:22:39La GüiraLa_duodecima73000014417500---6.677--3.860%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-01-03T22:49:001997rj7Manual testing263264--0.024--
2010-12-18T09:50:00Architects Cubedm1_16264265--0.045--
2012-08-17T06:21:00Carsten KossendeyManual testing265266--0.090--
2013-02-02T13:32:00rjbelansManual testing266267--0.181--
2013-02-07T15:39:00SMoffatManual testing267268--0.362--
2013-02-08T20:31:00SMoffatManual testing268269--0.723--
2013-02-09T20:30:00Florimond C.arm.durga269270--1.447--
2013-09-05T06:27:00ManpowreManual testing270271--2.894--
2014-01-20T16:58:00PascalBieriManual testing271272--5.787--
2016-11-25T12:55:08Judge HaleManual testing272273--11.57--
2016-12-16T22:46:11RichD0Manual testing273274--23.15--
2016-12-17T18:15:22ANONYMOUSManual testing274275--46.30--


ECM factoring results:
No ECM results for M82642081


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2018-12-22T19:53:51arnaudCHAMOT302DFFB3537A835B__257.9


PRP results:
No PRP results for M82642081


P-1 factor-bounds graph:
B1 = 730000, B2 = 14417500 (P-1 stage 2)
B1 = 730000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-12-22T19:53:51+00:00