is 2 2489719 - 1
has 749481 decimal digits
takes 0.173 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE8071B0CCD388E20double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.940467.6471%2382500857701000.69657.5508%24.636970.0900%2.4429%
PrimeNet2590.030862.7119%100001800000.00192.5359%0.032863.6575%0.9456%
GPU722630.641065.0794%110001600000.00191.3809%0.643065.5616%0.4822%
Difference+5+23.2994+2.5677%+2371500+85610100+0.6946+6.1699%+23.9940+4.5284%+4.5284%

Known prime factors (1 factor, 77.0 bits, 0.00309359% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24897191534107650401570648737592477.02230808851328233641
13 × 41 × 57802722942277
2020-05-14415780272294227721,025316,732591,566

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--0.786%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.263%
2011-01-21T12:08:00Oscar Östlin950001947500---0.020--2.379%
2014-09-10T00:51:00Jocelyn LaroucheManual testing120780120780---0.012--0.917%
2014-11-24T01:41:00mikrMSI238250085770100---0.697--7.551%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-15T22:15:00Sturle Sundegiovanni.ifi260261--0.062--
2012-06-10T16:43:00Sebastian HornbostelManual testing261262--0.123--
2013-01-14T11:53:00dbaughManual testing262263--0.394--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.789--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.501--
2015-10-30T09:42:35ramgeisManual testing265266--3.001--
2017-07-24T22:21:28Gordon SpenceManual testing266267--6.003--
2019-05-13T13:38:14TJAOIManual testing267268--12.01--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.400 GHz-days
Estimated T-Level:1.850
DigitsB1CurvesCompleteFacMiss
201100037 / 1000.37068.945%
255000037 / 2800.13287.601%

New Calculation Method

Total ECM effort:3.400 GHz-days
Estimated T-Level:1.850
DigitsB1CompleteFacMiss
20110001.19430.314%
25500000.10889.774%
302500000.00799.338%


ECM Summary

B1B2factorcurvesGHz-days
500005000000363.308
50000500000010.092


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-21T00:00:00ANONYMOUSv4_computersE8071B0CCD388E200.173
2018-05-31T19:15:06kkmrkkblmbrbkoldE8071B0CCD388E200.173


PRP results:
dateuseridcompidcofactorsres64PRP
2020-05-15T16:30:20mnd9f4th
153410765040157064873759
71CE6A2D56274C2Eno
2020-05-15T20:51:59oodairacom1
153410765040157064873759
71CE6A2D56274C2Eno


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 120780 (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: 2020-05-15T20:51:59+00:00