is 2 5085019 - 1
has 1530744 decimal digits
takes 0.705 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1283B79B4075EDAEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.843465.6716%200000020000000.40203.8271%6.245466.9854%1.3138%
PrimeNet2610.060462.2951%220005000000.00973.4078%0.070163.5800%1.2849%
GPU722651.434764.6154%340007000000.01412.4229%1.448965.4727%0.8573%
Difference+2+4.4087+1.0563%+1966000+1300000+0.3878+1.4042%+4.7965+1.5127%+1.5127%

Known prime factors (1 factor, 87.5 bits, 0.00172011% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
50850192140028442396735109872092872787.46821042482264045966297
7 × 23 × 31 × 89107 × 129917 × 364193
2017-07-301299173641936,826,8540.02870.0531

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-06-23T00:00:00ANONYMOUSv4_computers2000020000---0.004--0.370%
2009-08-22T03:35:00harleeP4_260055000907500---0.020--2.227%
2017-07-30T12:49:25mikrS069200000020000002787.4680.4021.4100.8043.827%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:08Mark RoseManual testing21261--0.060--
2008-12-28T12:07:00Sturle Sundebuxtehude.ifi261262--0.060--
2009-07-27T03:14:00GrunwalderGIMPManual testing21263--0.314--
2016-02-23T16:39:08Mark RoseManual testing262263--0.193--
2014-09-01T13:54:00krackerManual testing263264--0.386--
2014-09-15T00:12:00monstManual testing264265--0.735--
2015-08-03T11:44:00snme2pm1Manual testing265266--1.470--
2016-05-24T17:43:32Gordon SpenceManual testing266267--2.939--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.897 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.29074.802%
25500000.02697.410%
302500000.00299.839%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.897


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-11T00:00:00netconxv4_computers1283B79B4075EDAE0.705
2000-07-17T00:00:00ANONYMOUSv4_computers1283B79B4075EDAE0.705


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:09:53alpertronManual testing
214002844239673510987209287
58454F973BA6D7__no
2018-01-19T13:38:04kkmrkkblmbrbkc4.xlarge
214002844239673510987209287
58454F973BA6D7__no


P-1 factor-bounds graph:
B1 = 2000000 (P-1 stage 1)
B1 = 55000, B2 = 907500 (P-1 stage 2)
B1 = 55000 (P-1 stage 1)
B1 = 20000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
TF factor-bounds graph:
267
266
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2018-01-19T13:38:04+00:00