is 2 5188219 - 1
has 1561810 decimal digits
takes 0.819 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFF5181F731AC36C9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.727265.6716%600009750000.02522.3172%5.752366.4671%0.7955%
PrimeNet2620.118462.9032%220004500000.01042.9250%0.128863.9883%1.0851%
GPU722662.846565.1515%300005500000.01341.9417%2.859965.8282%0.6766%
Difference+1+2.8807+0.5201%+30000+425000+0.0118+0.3756%+2.8925+0.6390%+0.6390%

Known prime factors (1 factor, 65.1 bits, 0.00125565% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5188219408164245811581710072065.1463933568010637
32 × 71 × 6155818483
2010-12-167161558184831.872976.796143.43

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-22T05:52:00Carsten Kossendeyleela25000337500---0.010--1.405%
2009-10-11T08:01:00harleeP4_260060000975000---0.025--2.317%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-02-12T00:00:00ANONYMOUSv4_computers21261--0.059--
1998-05-23T00:00:00ANONYMOUSv4_computers21262--0.118--
2009-06-20T15:25:00GrunwalderGIMPManual testing262263--0.189--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00Stephen Woodv4_computersFF5181F731AC36C90.819
2000-06-11T00:00:00ANONYMOUSv4_computersFF5181F731AC36C90.819


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T19:30:35kkmrkkblmbrbkManual testing
40816424581158171007
A9AD1F0434B322__no
2018-05-25T22:43:36krackerGRID-11
40816424581158171007
A9AD1F0434B322__no


P-1 factor-bounds graph:
B1 = 60000, B2 = 975000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 337500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
100
101
102
103
104
105
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
263
262
261
250
260
270
280
290
2100
Last modified: 2018-05-25T22:43:36+00:00