is 2 5561869 - 1
has 1674290 decimal digits
takes 0.878 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L890EF361FC6D5BEEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.342465.6716%5000050000000.07323.2216%5.415666.7776%1.1059%
PrimeNet2620.110562.9032%240005500000.01213.1672%0.122564.0781%1.1749%
GPU722662.655365.1515%340007000000.01612.1577%2.671465.9034%0.7519%
Difference+1+2.6871+0.5201%+16000+4300000+0.0571+1.0639%+2.7442+0.8741%+0.8741%

Known prime factors (1 factor, 67.4 bits, 0.00121110% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
55618691893405401286155667772167.36017021305259852
22 × 4255326314963
2015-07-05442553263149639.427853,08799,152

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-06-06T06:59:00Carsten Kossendeyleela30000390000---0.011--1.559%
2010-11-29T03:35:00Squeeky_SquirrelP4_2600650001023750---0.027--2.411%
unknown500005000000---0.073--3.222%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-29T00:00:00ANONYMOUSv4_computers21262--0.110--
1998-09-20T00:00:00delongv4_computers21262--0.110--
2009-02-11T05:10:00GrunwalderGIMPManual testing262263--0.176--
2014-12-16T20:34:00NesowaManual testing263264--0.353--
2014-12-17T02:12:00monstManual testing264265--0.672--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.720 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.720 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.720


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-09-23T00:00:00ANONYMOUSv4_computers890EF361FC6D5BEE0.878


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-07T10:45:49Oliver KruseThreadripper
189340540128615566777
E60762E1E52E6D__no
2018-04-01T09:07:10kkmrkkblmbrbkc5.xlarge
189340540128615566777
E60762E1E52E6D__no


P-1 factor-bounds graph:
B1 = 50000, B2 = 5000000 (P-1 stage 2)
B1 = 65000, B2 = 1023750 (P-1 stage 2)
B1 = 65000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000, B2 = 390000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-04-01T09:07:10+00:00