is 2 2025377 - 1
has 609700 decimal digits
takes 0.133 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8E685F028031E38Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26829.429069.1176%40000002000000001.39948.7508%30.828571.8201%2.7025%
PrimeNet2580.019063.7931%90001500000.00162.6133%0.020564.7393%0.9462%
GPU722620.303366.1290%80001200000.00131.2740%0.304766.5606%0.4315%
Difference+6+29.1257+2.9886%+3992000+199880000+1.3981+7.4768%+30.5238+5.2596%+5.2596%

Known prime factors (1 factor, 72.5 bits, 0.00358150% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
202537768610888526511891795932272.5391693780677042148
22 × 423445169260537
2020-03-024423445169260537928.902,199,4804,108,016

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-04-28T00:00:00Jocelyn Larouchev4_computers20002000---0.000--0.017%
2003-01-09T00:00:00ANONYMOUSv4_computers25000418750---0.004--1.083%
2010-12-14T09:47:00Jocelyn LaroucheManual testing202537202537---0.019--1.172%
2013-10-21T19:26:00David Campeaui5-2500k58000015080000---0.131--4.746%
2019-03-26T15:49:20mikrMSI400000020000000012---1.399--8.751%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:03Mark RoseManual testing258260--0.057--
2009-01-03T05:31:00Sturle Sundegassmann.ifi260261--0.076--
2012-02-06T00:47:00Sebastian HornbostelManual testing261262--0.152--
2013-02-11T20:23:00dbaughManual testing262263--0.485--
2015-04-10T15:56:00VictordeHollanderManual testing263264--0.969--
2015-04-10T15:56:00VictordeHollanderManual testing264265--1.845--
2015-10-31T16:44:08ramgeisManual testing265266--3.690--
2016-07-06T22:01:13Gordon SpenceManual testing266267--7.379--
2019-03-20T02:02:06chuenkitManual testing267268--14.76--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.523 GHz-days
Estimated T-Level:3.850
DigitsB1CurvesCompleteFacMiss
201100077 / 1000.77046.122%
255000077 / 2800.27575.920%

New Calculation Method

Total ECM effort:6.523 GHz-days
Estimated T-Level:3.850
DigitsB1CompleteFacMiss
20110002.4848.342%
25500000.22479.892%
302500000.01498.627%


ECM Summary

B1B2factorcurvesGHz-days
500005000000756.353
50000500000020.169


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computers8E685F028031E38F0.133


PRP results:
dateuseridcompidcofactorsres64PRP
2020-03-03T11:58:27Niels_Mache_NextcloudSuperDry-X
6861088852651189179593
7F732E4CC04EA0B5no
2020-03-03T12:10:19Jinyuan WangManual testing
6861088852651189179593
7F732E4CC04EA0B5no
2020-03-04T05:43:28oodairacom2
6861088852651189179593
7F732E4CC04EA0B5no


P-1 factor-bounds graph:
B1 = 4000000, B2 = 200000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 580000, B2 = 15080000 (P-1 stage 2)
B1 = 580000 (P-1 stage 1)
B1 = 202537 (P-1 stage 1)
B1 = 25000, B2 = 418750 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-03-04T05:43:28+00:00