is 2 1977631 - 1
has 595327 decimal digits
takes 0.130 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L0C3D53559188C0E8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271241.742970.4225%19776312472038751.46236.6139%243.205272.3788%1.9562%
PrimeNet2580.019463.7931%80001400000.00142.4735%0.020964.6887%0.8956%
GPU722620.310766.1290%80001000000.00121.1969%0.311966.5344%0.4054%
Difference+9+241.4323+4.2935%+1969631+247103875+1.4611+5.4170%+242.8933+5.8443%+5.8443%

Known prime factors (1 factor, 82.5 bits, 0.00416954% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
197763166426885884301315611011372582.4581679456022996739928
23 × 19 × 88931377 × 124242457
2020-08-0288931377124242457521,8598.661917.255

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-26T15:50:00kurlyslice100000030000000---0.246--4.323%
2018-01-23T13:04:03Jocelyn Larouchelow 4M19776313000000012---0.334--4.646%
2018-02-14T12:53:57Jocelyn Larouchelow 4M19776316000000012---0.490--5.282%
2018-03-06T12:48:08Jocelyn Larouchelow 4M197763112000000012---0.802--5.928%
2018-05-28T10:19:12Jocelyn Larouchelow 4M197763119776310012---1.206--6.401%
2018-11-26T12:53:53Jocelyn LaroucheManual testing197763124720387512---1.462--6.614%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-27T00:00:00kbutlerv4_computers21258--0.019--
2016-02-23T16:29:01Mark RoseManual testing258260--0.058--
2009-12-23T07:33:00S485122USB-W260261--0.078--
2016-02-23T16:29:01Mark RoseManual testing261262--0.155--
2011-09-03T15:11:00GrunwalderGIMPManual testing21263--0.807--
2016-02-23T16:29:01Mark RoseManual testing262263--0.496--
2015-03-17T13:10:00lycornManual testing263264--0.993--
2015-03-17T13:10:00lycornManual testing264265--1.889--
2015-09-10T08:47:00ramgeisManual testing265266--3.779--
2018-03-08T06:00:50YxinityManual testing266267--7.557--
2018-03-08T06:00:50YxinityManual testing267268--15.11--
2018-03-08T06:00:50YxinityManual testing268269--30.23--
2018-03-08T06:00:50YxinityManual testing269270--60.46--
2018-06-11T14:43:00ramgeisManual testing270271--120.9--


ECM factoring results:

Old Calculation Method

Total ECM effort:10.981 GHz-days
Estimated T-Level:22.321
DigitsB1CurvesCompleteFacMiss
2011000130 / 1001.30027.075%
2550000130 / 2800.46462.806%

New Calculation Method

Total ECM effort:10.981 GHz-days
Estimated T-Level:22.321
DigitsB1CompleteFacMiss
20110004.1941.509%
25500000.37968.454%
302500000.02397.693%
3510000000.00199.893%


ECM Summary

B1B2factorcurvesGHz-days
50000500000012910.90
50000500000010.084


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00kbutlerv4_computers0C3D53559188C0E80.130
2015-07-12T18:10:00MadPooManual testing0C3D53559188C0E80.130


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-02T15:44:43riccardo ubertiTuareg8C
6642688588430131561101137
BC7BBED0965F66ACno
2020-08-03T08:13:55marssystemsSYSTEM01
6642688588430131561101137
BC7BBED0965F66ACno


P-1 factor-bounds graph:
B1 = 1977631, B2 = 247203875 (P-1 stage 2)
B1 = 1977631, B2 = 197763100 (P-1 stage 2)
B1 = 1977631, B2 = 120000000 (P-1 stage 2)
B1 = 1977631, B2 = 60000000 (P-1 stage 2)
B1 = 1977631, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1977631 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-08-03T08:13:55+00:00