is 2 81309161 - 1
has 24476497 decimal digits
takes 253.724 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L341AB4C867C311__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27594.108864.0000%690000139725006.39643.8025%100.505265.3689%1.3689%
PrimeNet2715.879861.9718%340000160000005.39895.2572%11.278663.9710%1.9992%
GPU7227594.108864.0000%550000180000006.79033.8825%100.899165.3977%1.3977%
Difference---+140000-4027500-0.3939-0.0800%-0.3939-0.0288%-0.0288%

Known prime factors:
No known factors for M81309161

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2017-05-10T12:52:09arnaudsrv-610690000139725006---6.396--3.802%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-12-12T21:20:00Architects Cubedm1_51264265--0.046--
2012-08-27T06:17:00Carsten KossendeyManual testing265266--0.092--
2013-01-30T09:37:00phoenicisManual testing266267--0.184--
2013-02-14T00:28:00Simon HarrisonManual testing267268--0.368--
2013-02-19T13:18:00PoakenPent_D268269--0.735--
2013-02-25T09:12:00JMGarciajmgarcia-W08269270--1.470--
2014-03-11T13:06:00ITSWUV270271--2.941--
2016-09-19T10:55:23Judge HaleManual testing271272--5.882--
2016-09-19T10:55:23Judge HaleManual testing272273--11.76--
2016-11-12T00:56:46ANONYMOUSManual testing273274--23.53--
2016-11-12T00:56:46ANONYMOUSManual testing274275--47.06--


ECM factoring results:
No ECM results for M81309161


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2017-09-09T14:51:15Radzik341AB4C867C311__253.7


PRP results:
No PRP results for M81309161


P-1 factor-bounds graph:
B1 = 690000, B2 = 13972500 (P-1 stage 2)
B1 = 690000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2017-09-09T14:51:15+00:00