is 2 4087439 - 1
has 1230442 decimal digits
takes 0.510 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA6E83036E31E591Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271116.962869.0141%3500000900000001.48536.4340%118.448171.0077%1.9936%
PrimeNet2610.075263.9344%170003200000.00612.7779%0.081264.9363%1.0019%
GPU722651.784966.1538%220004000000.00771.8076%1.792666.7656%0.6118%
Difference+6+115.1779+2.8602%+3478000+89600000+1.4776+4.6264%+116.6554+4.2421%+1.3818%

Known prime factors:
No known factors for M4087439

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-21T19:45:00Carsten Kossendeydurandal20000300000---0.006--0.662%
2011-07-30T00:10:00harleeP4_2600700001102500---0.023--1.430%
2013-12-18T17:09:00Squeeky_SquirrelT7500_22001400003255000---0.056--2.197%
2020-06-15T17:56:50vbcurtisManual testing35000009000000012---1.485--6.434%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-08-19T14:25:47ATH5960X250000017750000027--2.377


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-25T00:00:00ANONYMOUSv4_computers21261--0.075--
2010-11-09T14:29:00Grant McCrackenthumper261262--0.075--
2011-07-01T19:13:00GrunwalderGIMPManual testing21263--0.390--
2016-02-23T16:29:48Mark RoseManual testing262263--0.240--
2013-08-29T11:33:00JayderManual testing263264--0.480--
2013-11-01T12:14:00David CampeauManual testing264265--0.914--
2015-05-23T23:25:00snme2pm1Manual testing265266--1.828--
2016-10-12T16:26:01kkmrkkblmbrbkManual testing266267--3.656--
2018-11-09T16:54:00YxinityManual testing267268--7.313--
2021-07-22T10:08:16TJAOIManual testing268269--14.63--
2021-09-19T19:40:18mikrManual testing269270--29.25--
2022-04-17T17:30:16mikrManual testing270271--58.50--


ECM factoring results:
Total ECM effort:2.169 GHz-days
Estimated T-Level:2.308
DigitsB1CompleteFacMiss
20110000.46263.031%
25500000.04395.819%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000122.169


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-04-19T00:00:00jingfiredv4_computersA6E83036E31E591A0.510


PRP results:
No PRP results for M4087439


P-1 factor-bounds graph:
B1 = 3500000, B2 = 90000000 (P-1 stage 2)
B1 = 3500000 (P-1 stage 1)
B1 = 140000, B2 = 3255000 (P-1 stage 2)
B1 = 140000 (P-1 stage 1)
B1 = 70000, B2 = 1102500 (P-1 stage 2)
B1 = 70000 (P-1 stage 1)
B1 = 20000, B2 = 300000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-17T17:30:16+00:00