is 2 1939787 - 1
has 583935 decimal digits
takes 0.105 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L788B45970C947B68double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.727569.1176%80000003200000001.96659.7484%32.694072.1282%3.0105%
PrimeNet2580.019863.7931%80001400000.00122.4643%0.021064.6853%0.8922%
GPU722620.316766.1290%8000900000.00101.1518%0.317766.5192%0.3901%
Difference+6+30.4108+2.9886%+7992000+319910000+1.9655+8.5966%+32.3763+5.6090%+5.6090%

Known prime factors (1 factor, 90.8 bits, 0.00468046% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
193978721419773330660814317468084492890.791552116632667937621952
26 × 372 × 79 × 2617 × 30480114529
2020-01-08261730480114529130,718,352130.63243.98

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-28T06:12:00markrtiny2750006000000---0.046--3.554%
2015-10-08T11:52:18Bruno Victal5820K-linux5000001500000012---0.101--4.632%
2016-12-16T01:10:43Jocelyn Larouchelow 4M568903568903---0.045--1.892%
2016-12-18T04:24:52Jocelyn Larouchelow 4M682683682683---0.054--2.042%
2016-12-24T21:06:39Jocelyn Larouchelow 4M819219819219---0.064--2.200%
2017-01-04T23:07:22Jocelyn Larouchelow 4M983062983062---0.077--2.363%
2017-01-22T06:40:05Jocelyn Larouchelow 4M11796741179674---0.093--2.533%
2017-04-13T01:58:13Jocelyn Larouchelow 4M14156081415608012---0.166--5.089%
2018-02-04T03:38:02Jocelyn Larouchelow 4M19397872831216012---0.266--5.978%
2018-02-04T15:09:05mikrS067800000032000000012---1.966--9.748%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.059--
2010-01-29T10:30:00S485122USB-W260261--0.079--
2016-02-23T16:28:59Mark RoseManual testing261262--0.158--
2011-08-27T22:21:00GrunwalderGIMPManual testing21263--0.823--
2016-02-23T16:28:59Mark RoseManual testing262263--0.506--
2015-05-07T07:03:00lycornManual testing263264--1.012--
2015-05-07T07:03:00lycornManual testing264265--1.926--
2015-09-05T13:49:00ramgeisManual testing265266--3.852--
2017-12-04T13:35:48TJAOIManual testing266267--7.705--
2019-05-10T20:32:09chuenkitManual testing267268--15.41--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.997 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.997 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.7260.016%
25500000.77745.973%
302500000.04895.300%
3510000000.00299.779%


ECM Summary

B1B2factorcurvesGHz-days
500005000000664.589
50000500000030.209
50000750000018215.20


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computers788B45970C947B680.105
2015-06-27T00:55:00MadPooManual testing788B45970C947B680.105


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-08T13:36:35mrhx
2141977333066081431746808449
CC29EDEC95775518no
2020-01-09T13:05:11marssystemsSYSTEM01
2141977333066081431746808449
CC29EDEC95775518no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1939787, B2 = 28312160 (P-1 stage 2)
B1 = 1415608, B2 = 14156080 (P-1 stage 2)
B1 = 1939787 (P-1 stage 1)
B1 = 1415608 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1179674 (P-1 stage 1)
B1 = 983062 (P-1 stage 1)
B1 = 819219 (P-1 stage 1)
B1 = 682683 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 568903 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-17T11:24:36+00:00