is 2 4021001 - 1
has 1210442 decimal digits
takes 0.502 GHz-days to do one PRP test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-L144D449CFFC64B07double-checked
PRP1F9177082A54ACEF

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27059.425768.5714%50000001000000001.84037.2813%61.265970.8598%6.9254%
PrimeNet2610.076463.9344%160003200000.00592.7305%0.082364.9192%0.9848%
GPU722651.814466.1538%220003600000.00731.7508%1.821766.7464%0.5926%
Difference+5+57.6113+2.4176%+4978000+99640000+1.8330+5.5305%+59.4442+4.1134%+4.1134%

Known prime factors (1 factor, 76.2 bits, 0.00189462% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4021001857599332052848600564732376.18310664002969072236
22 × 32 × 7 × 268439 × 157642787
2021-06-062684391576427875,466.81.59922.9011

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-11-23T10:36:00harleeP4_260040000610000---0.013--1.191%
2013-06-23T11:11:00Squeeky_SquirrelP4_26001200002280000---0.043--2.196%
2015-01-03T21:41:00Nesowanewfs2250004556250---0.083--2.891%
2020-06-05T09:52:08GdSManual testing23962405990598812---1.000--6.323%
2021-06-08T10:13:00riccardo ubertiColab_noGPU15500000010000000012---1.840--7.281%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-06-06T00:03:03ATH5960X250000017250000027P-12376.1832.053


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-09-30T00:00:00ANONYMOUSv4_computers?261--0.038--
2009-11-09T22:15:00GrunwalderGIMPManual testing21263--0.397--
2016-02-23T16:29:45Mark RoseManual testing261263--0.321--
2013-08-01T22:11:00JayderManual testing263264--0.488--
2013-10-21T09:48:00David CampeauManual testing264265--0.929--
2015-05-19T03:07:00snme2pm1Manual testing265266--1.858--
2016-09-03T17:08:05kkmrkkblmbrbkManual testing266267--3.717--
2018-10-01T17:58:16mikrManual testing267268--7.434--
2019-10-16T18:40:39mikrManual testing268269--14.87--
2019-10-16T18:40:39mikrManual testing269270--29.73--


ECM factoring results:
Total ECM effort:2.161 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

ECM Summary

B1B2factorcurvesGHz-days
500005000000122.161


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-07T00:00:00ANONYMOUSv4_computers144D449CFFC64B070.502


PRP results:
dateuseridcompidcofactorsres64PRP
2021-06-06T09:26:49riccardo ubertiNomad2C
85759933205284860056473
1F9177082A54ACEFno


P-1 factor-bounds graph:
B1 = 5000000, B2 = 100000000 (stage 2)
B1 = 2396240, B2 = 59905988 (stage 2)
B1 = 5000000 (stage 1)
B1 = 2396240 (stage 1)
B1 = 225000, B2 = 4556250 (stage 2)
B1 = 120000, B2 = 2280000 (stage 2)
B1 = 225000 (stage 1)
B1 = 120000 (stage 1)
B1 = 40000, B2 = 610000 (stage 2)
B1 = 40000 (stage 1)
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TF factor-bounds graph:
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Last modified: 2021-06-08T10:13:00+00:00