is 2 2499439 - 1
has 752407 decimal digits
takes 0.173 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L7DAAD5D563E3DAA5double-checked
PRPD4E45392918543__verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.847367.6471%2382500857701000.69657.5538%24.543870.0909%2.4439%
PrimeNet2590.030762.7119%100001800000.00192.5378%0.032763.6582%0.9463%
GPU722630.638565.0794%110001700000.00201.4074%0.640565.5708%0.4915%
Difference+5+23.2088+2.5677%+2371500+85600100+0.6946+6.1464%+23.9033+4.5201%+4.5201%

Known prime factors (1 factor, 89.7 bits, 0.00358796% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24994399908828194586794957272484972789.679198221044694165269832
23 × 112 × 31 × 149 × 173 × 349 × 734268523
2020-10-2534973426852385,033,0814.02357.5147

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.235%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.787%
2010-12-16T22:40:00Jocelyn LaroucheManual testing2000020000---0.002--0.264%
2011-01-25T06:25:00Oscar Östlin950001971250---0.020--2.388%
2014-09-10T00:51:00Jocelyn LaroucheManual testing120679120679---0.012--0.917%
2014-12-18T01:38:00mikrMSI238250085770100---0.697--7.554%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-11T06:46:00Sturle Sundegnom.ifi260261--0.061--
2012-06-11T17:43:00Sebastian HornbostelManual testing261262--0.123--
2013-01-14T11:53:00dbaughManual testing262263--0.393--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.786--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.495--
2015-10-31T16:44:07ramgeisManual testing265266--2.990--
2017-07-27T10:22:10Gordon SpenceManual testing266267--5.980--
2019-02-25T14:14:30TJAOIManual testing267268--11.96--


ECM factoring results:

Old Calculation Method

Total ECM effort:7.814 GHz-days
Estimated T-Level:4.250
DigitsB1CurvesCompleteFacMiss
201100085 / 1000.85042.559%
255000085 / 2800.30473.778%

New Calculation Method

Total ECM effort:7.814 GHz-days
Estimated T-Level:4.250
DigitsB1CompleteFacMiss
20110002.7426.445%
25500000.24878.051%
302500000.01598.486%


ECM Summary

B1B2factorcurvesGHz-days
500005000000797.263
50000500000060.552


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computers7DAAD5D563E3DAA50.173
2018-06-02T04:03:08kkmrkkblmbrbkold7DAAD5D563E3DAA50.173


PRP results:
dateuseridcompidcofactorsres64PRP
2020-10-27T23:52:02arnaudSRV-130
990882819458679495727248497
D4E45392918543__no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1971250 (P-1 stage 2)
B1 = 120679 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-10-27T23:52:02+00:00