is 2 2094779 - 1
has 630592 decimal digits
takes 0.138 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3520EF3002502803double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.184868.6567%500000150000000.12305.1516%14.307770.2714%1.6147%
PrimeNet2580.018363.7931%90001600000.00162.6765%0.020064.7622%0.9691%
GPU722620.293366.1290%90001400000.00151.4009%0.294866.6035%0.4745%
Difference+5+13.8915+2.5277%+491000+14860000+0.1214+3.7507%+14.0129+3.6679%+3.6679%

Known prime factors (1 factor, 70.1 bits, 0.00334515% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
209477912423600290267608538092270.074296537255010376
23 × 37067156876297
2015-07-29837067156876297176.73192,536359,604

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.277%
2009-07-27T06:06:00harleeP4_260020000260000---0.003--1.020%
2010-12-28T23:08:00Jocelyn LaroucheManual testing3000030000---0.003--0.414%
2011-01-09T14:30:00Jocelyn LaroucheManual testing5000050000---0.005--0.595%
2011-01-22T07:46:00James HeinrichQ66001400003150000---0.029--3.129%
2016-03-16T13:44:17alpertronManual testing5000001500000012---0.123--5.152%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-17T00:00:00ANONYMOUSv4_computers21258--0.018--
2022-03-09T08:46:54LordJuliusManual testing21260--0.073--
2009-01-03T10:52:00Sturle Sundemorovan.ifi260261--0.073--
2012-03-23T21:48:00Sebastian HornbostelManual testing261262--0.147--
2013-09-03T09:36:00ramgeisManual testing262263--0.469--
2015-04-10T15:56:00VictordeHollanderManual testing263264--0.937--
2015-04-10T15:56:00VictordeHollanderManual testing264265--1.784--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.042 GHz-days
Estimated T-Level:1.200
DigitsB1CurvesCompleteFacMiss
201100024 / 1000.24078.568%
255000024 / 2800.08691.772%

New Calculation Method

Total ECM effort:2.042 GHz-days
Estimated T-Level:1.200
DigitsB1CompleteFacMiss
20110000.77446.108%
25500000.07093.242%
302500000.00499.570%


ECM Summary

B1B2factorcurvesGHz-days
500005000000221.872
50000500000020.170


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computers3520EF30025028030.138


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-06T22:48:43Oliver KruseGTX-2
1242360029026760853809
5D31273D1B3B59__no
2017-11-17T03:39:28kkmrkkblmbrbkold
1242360029026760853809
5D31273D1B3B59__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 140000, B2 = 3150000 (P-1 stage 2)
B1 = 140000 (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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TF factor-bounds graph:
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Last modified: 2022-04-23T20:30:57+00:00