is 2 2465081 - 1
has 742064 decimal digits
takes 0.171 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD6C3685AD471F9ACdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.179767.6471%60000001800000001.55699.0157%25.736670.5639%2.9168%
PrimeNet2590.031262.7119%100001800000.00192.5312%0.033163.6557%0.9438%
GPU722630.647465.0794%100001600000.00181.3350%0.649365.5456%0.4662%
Difference+5+23.5322+2.5677%+5990000+179840000+1.5551+7.6806%+25.0873+5.0183%+5.0183%

Known prime factors (1 factor, 68.0 bits, 0.00276045% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24650813049940426482350973032168.04761862884555971
3 × 20620961518657
2020-05-3132062096151865733.266112,993211,040

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.234%
2003-10-31T00:00:00Team Prime Ribv4_computers15000232500---0.003--0.788%
2010-11-19T22:14:00Jocelyn LaroucheManual testing2000020000---0.002--0.263%
2010-11-23T00:51:00Jocelyn LaroucheManual testing246508246508---0.025--1.338%
2013-10-22T01:22:00David Campeaui5-2500k59000015930000---0.143--4.920%
2019-04-18T16:31:02Sid & AndyBullseye600000018000000012---1.557--9.016%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:14Mark RoseManual testing259260--0.031--
2009-01-15T15:25:00Sturle Sundegorro.ifi260261--0.062--
2012-06-08T07:43:00Sebastian HornbostelManual testing261262--0.125--
2013-01-23T08:28:00dbaughManual testing262263--0.398--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.796--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.516--
2015-10-26T11:51:01ramgeisManual testing265266--3.031--
2017-07-16T22:18:22Gordon SpenceManual testing266267--6.063--
2019-06-24T09:35:57TJAOIManual testing267268--12.13--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.945 GHz-days
Estimated T-Level:2.150
DigitsB1CurvesCompleteFacMiss
201100043 / 1000.43064.910%
255000043 / 2800.15485.740%

New Calculation Method

Total ECM effort:3.945 GHz-days
Estimated T-Level:2.150
DigitsB1CompleteFacMiss
20110001.38724.980%
25500000.12588.218%
302500000.00899.231%


ECM Summary

B1B2factorcurvesGHz-days
500005000000423.853
50000500000010.092


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computersD6C3685AD471F9AC0.171
2018-05-27T21:50:23kkmrkkblmbrbkoldD6C3685AD471F9AC0.171


PRP results:
dateuseridcompidcofactorsres64PRP
2020-06-01T07:10:56atrenchDesktop
304994042648235097303
8010552150C41178no
2020-06-01T14:42:09Klaus Nordmannno1
304994042648235097303
8010552150C41178no


P-1 factor-bounds graph:
B1 = 6000000, B2 = 180000000 (P-1 stage 2)
B1 = 6000000 (P-1 stage 1)
B1 = 590000, B2 = 15930000 (P-1 stage 2)
B1 = 590000 (P-1 stage 1)
B1 = 246508 (P-1 stage 1)
B1 = 15000, B2 = 232500 (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: 2020-06-01T14:42:09+00:00