is 2 2079997 - 1
has 626142 decimal digits
takes 0.137 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L695641333A4711C6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26828.656269.1176%25000001250000000.87467.8908%29.530971.5545%2.4369%
PrimeNet2580.018563.7931%90001600000.00162.6729%0.020164.7609%0.9678%
GPU722620.295466.1290%90001400000.00151.3989%0.296966.6028%0.4738%
Difference+6+28.3609+2.9886%+2491000+124860000+0.8731+6.4919%+29.2340+4.9517%+4.9517%

Known prime factors (1 factor, 75.8 bits, 0.00364326% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2079997648597556204567695009432375.78015591309896229843
3 × 53 × 28517 × 3438599881
2020-06-012851734385998814,971.217.86433.359

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.223%
2009-07-25T17:06:00harleeP4_260020000260000---0.003--0.875%
2010-12-28T02:15:00Jocelyn LaroucheManual testing3000030000---0.003--0.351%
2011-01-07T22:30:00Jocelyn LaroucheManual testing5000050000---0.005--0.509%
2011-01-21T18:42:00James HeinrichQ66001350003105000---0.028--2.763%
2016-07-17T03:53:35Jocelyn LaroucheManual testing182443621000012---0.049--3.386%
2016-11-04T12:39:34Jocelyn Larouchelow 4M218931218931---0.021--1.225%
2016-11-06T00:28:16Jocelyn Larouchelow 4M262717262717---0.025--1.342%
2016-11-11T16:54:50Jocelyn Larouchelow 4M315260315260---0.030--1.466%
2017-03-27T11:13:53mikrMSI250000012500000012---0.875--7.891%
2017-05-13T16:00:17Jocelyn Larouchelow 4M39031239031206---0.055--3.411%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-10T00:00:00ANONYMOUSv4_computers21258--0.018--
2016-02-23T16:29:05Mark RoseManual testing258260--0.055--
2009-01-03T08:38:00Sturle Sundeinteravia.ifi260261--0.074--
2012-03-17T12:47:00Sebastian HornbostelManual testing261262--0.148--
2013-09-02T08:36:00ramgeisManual testing262263--0.472--
2015-03-31T15:56:00VictordeHollanderManual testing263264--0.944--
2015-03-31T15:56:00VictordeHollanderManual testing264265--1.796--
2015-11-05T09:47:17ramgeisManual testing265266--3.593--
2016-09-14T10:22:37Gordon SpenceManual testing266267--7.185--
2019-04-01T03:15:21chuenkitManual testing267268--14.37--


ECM factoring results:

Old Calculation Method

Total ECM effort:7.989 GHz-days
Estimated T-Level:4.700
DigitsB1CurvesCompleteFacMiss
201100094 / 1000.94038.878%
255000094 / 2800.33671.440%

New Calculation Method

Total ECM effort:7.989 GHz-days
Estimated T-Level:4.700
DigitsB1CompleteFacMiss
20110003.0324.821%
25500000.27476.029%
302500000.01798.327%


ECM Summary

B1B2factorcurvesGHz-days
500005000000937.904
50000500000010.085


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computers695641333A4711C60.137
2017-06-06T17:09:08kkmrkkblmbrbkc4.large695641333A4711C60.137


PRP results:
dateuseridcompidcofactorsres64PRP
2020-06-02T05:05:49CrypticCluecruncher
64859755620456769500943
2AB115248BDD8A87no
2020-06-04T01:35:10Luigi Morelli9800X
64859755620456769500943
2AB115248BDD8A87no


P-1 factor-bounds graph:
B1 = 2500000, B2 = 125000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 390312, B2 = 3903120 (P-1 stage 2)
B1 = 182443, B2 = 6210000 (P-1 stage 2)
B1 = 390312 (P-1 stage 1)
B1 = 315260 (P-1 stage 1)
B1 = 135000, B2 = 3105000 (P-1 stage 2)
B1 = 262717 (P-1 stage 1)
B1 = 218931 (P-1 stage 1)
B1 = 182443 (P-1 stage 1)
B1 = 135000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 20000, B2 = 260000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 20000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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1010
TF factor-bounds graph:
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Last modified: 2020-06-04T01:35:10+00:00