is 2 1424947 - 1
has 428952 decimal digits
takes 0.054 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9BD23355CF2106EEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.852668.6567%2500000625000000.31947.3936%21.172070.9741%2.3174%
PrimeNet2560.006762.5000%65001100000.00072.7717%0.007463.5394%1.0394%
GPU722600.107865.0000%6000800000.00061.3027%0.108365.4559%0.4559%
Difference+7+20.7449+3.6567%+2494000+62420000+0.3188+6.0910%+21.0637+5.5182%+5.5182%

Known prime factors (1 factor, 70.5 bits, 0.00494902% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
142494716939935642300885725272270.521594405814472429
61681 × 9636773309
2016-07-05616819636773309306.0529.07054.289

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000236250---0.001--0.828%
2009-08-01T20:13:00markrlounge2000005000000---0.026--3.476%
2014-11-10T23:29:00Jocelyn LaroucheManual testing245043245043---0.014--1.384%
2015-01-15T22:03:00Jocelyn LaroucheManual testing367564367564---0.020--1.677%
2015-02-15T21:12:00Jocelyn LaroucheManual testing404320404320---0.022--1.751%
2015-02-20T16:55:00Jocelyn LaroucheManual testing444752444752---0.025--1.826%
2015-02-27T19:06:00Jocelyn LaroucheManual testing489227489227---0.027--1.904%
2015-03-03T20:46:00Jocelyn LaroucheManual testing538149538149---0.030--1.983%
2015-03-12T10:39:00Jocelyn LaroucheManual testing591963591963---0.033--2.064%
2015-03-17T11:20:00alpertronManual testing200000060000000---0.286--7.216%
2016-08-27T10:53:42Bruno VictalManual testing25000006250000012---0.319--7.394%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-20T00:00:00ANONYMOUSv4_computers21257--0.013--
2003-07-13T00:00:00ANONYMOUSv4_computers21258--0.027--
2016-02-23T16:28:31Mark RoseManual testing258260--0.081--
2009-02-25T19:35:00Sturle Sundeothello.ifi260261--0.108--
2016-02-23T16:28:31Mark RoseManual testing261262--0.216--
2011-07-17T18:55:00GrunwalderGIMPManual testing21263--1.120--
2016-02-23T16:28:31Mark RoseManual testing262263--0.689--
2015-03-18T05:34:00snme2pm1Manual testing263264--1.378--
2015-03-18T05:34:00snme2pm1Manual testing264265--2.622--
2015-10-11T16:52:38ramgeisManual testing265266--5.244--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.448 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.448 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.35725.749%
302500000.11389.315%
3510000000.00899.236%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025011.80
50000500000010.047
250000350000005013.60


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-07-19T16:38:00MadPooManual testing9BD23355CF2106EE0.054


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T20:43:29Oliver KruseGTX-2
1693993564230088572527
5BE97D1250C3CA__no
2017-10-26T16:00:35kkmrkkblmbrbkc4.xlarge
1693993564230088572527
5BE97D1250C3CA__no


P-1 factor-bounds graph:
B1 = 2500000, B2 = 62500000 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 591963 (P-1 stage 1)
B1 = 538149 (P-1 stage 1)
B1 = 489227 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 444752 (P-1 stage 1)
B1 = 404320 (P-1 stage 1)
B1 = 367564 (P-1 stage 1)
B1 = 245043 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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1010
TF factor-bounds graph:
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Last modified: 2022-03-03T12:23:12+00:00