is 2 2399387 - 1
has 722288 decimal digits
takes 0.162 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDD281F076C3BA2A2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.841767.6471%30000001000000000.81157.8466%25.653370.1857%2.5386%
PrimeNet2590.032062.7119%100001700000.00182.4795%0.033863.6364%0.9246%
GPU722630.665265.0794%100001400000.00171.2748%0.666965.5245%0.4452%
Difference+5+24.1765+2.5677%+2990000+99860000+0.8099+6.5719%+24.9864+4.6611%+4.6611%

Known prime factors (1 factor, 79.6 bits, 0.00331591% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
23993878920054524858960320494312479.561185881946615092945
5 × 7 × 5310912760431227
2021-01-087531091276043122773,83428,343,75152,938,234

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-09T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.232%
2003-02-24T00:00:00ANONYMOUSv4_computers4096409600---0.003--0.475%
2003-09-21T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.232%
2015-12-18T20:27:33mikrMSI300000010000000012---0.812--7.847%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-26T00:00:00ANONYMOUSv4_computers21259--0.032--
2016-02-23T16:29:13Mark RoseManual testing259260--0.032--
2009-01-15T16:25:00Sturle Sundeghibu.ifi260261--0.064--
2012-06-02T15:43:00Sebastian HornbostelManual testing261262--0.128--
2013-12-04T21:14:00Jerry HallettManual testing262263--0.409--
2015-03-12T10:49:00VictordeHollanderManual testing263264--0.818--
2015-03-12T10:49:00VictordeHollanderManual testing264265--1.557--
2015-11-05T09:47:19ramgeisManual testing265266--3.114--
2017-06-27T22:16:40Gordon SpenceManual testing266267--6.229--
2019-02-25T14:14:31TJAOIManual testing267268--12.46--


ECM factoring results:

Old Calculation Method

Total ECM effort:10.058 GHz-days
Estimated T-Level:22.018
DigitsB1CurvesCompleteFacMiss
2011000113 / 1001.13032.120%
2550000113 / 2800.40466.745%

New Calculation Method

Total ECM effort:10.058 GHz-days
Estimated T-Level:22.018
DigitsB1CompleteFacMiss
20110003.6452.612%
25500000.32971.932%
302500000.02097.992%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001069.435
50000500000070.623


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-07T00:00:00ANONYMOUSv4_computersDD281F076C3BA2A20.162
2015-11-15T03:19:13MadPooManual testingDD281F076C3BA2A20.162


PRP results:
dateuseridcompidcofactorsres64PRP
2021-01-09T00:39:03ViliamF3
892005452485896032049431
E5D4D56490DEAD8Eno
2021-01-09T13:00:36kutensdeneb-b
892005452485896032049431
E5D4D56490DEAD8Eno


P-1 factor-bounds graph:
B1 = 3000000, B2 = 100000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 4096 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-01-09T13:00:36+00:00