is 2 1862933 - 1
has 560799 decimal digits
takes 0.101 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB82FA12D80AA90F6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.995269.1176%24883202049226301.06338.3859%33.058571.7074%2.5897%
PrimeNet2570.010363.1579%90001600000.00143.0270%0.011764.2731%1.1152%
GPU722610.164965.5738%100001500000.00141.6884%0.166366.1550%0.5812%
Difference+7+31.8303+3.5439%+2478320+204772630+1.0619+6.6975%+32.8922+5.5524%+5.5524%

Known prime factors (1 factor, 76.4 bits, 0.00410019% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1862933985885945939768517367772376.38426460585161671636
22 × 47 × 140747793413147
2019-12-03471407477934131479,950.5603,2101,126,628

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-06T06:00:00markrtiny2750006000000---0.046--3.535%
2015-10-07T04:11:27Bruno Victal5820K-linux5000001500000012---0.101--4.610%
2016-10-29T20:53:46Jocelyn Larouchelow 4M720000720000---0.057--2.075%
2016-12-30T23:10:08Jocelyn Larouchelow 4M864000864000---0.068--2.234%
2017-01-14T05:24:37Jocelyn Larouchelow 4M10368001036800---0.082--2.399%
2017-02-19T20:41:21Jocelyn Larouchelow 4M12441601244160012---0.146--4.880%
2017-12-27T03:28:27Jocelyn Larouchelow 4M24883202488320012---0.292--5.911%
2018-02-10T10:46:35Jocelyn Larouchelow 4M24883204976640012---0.398--6.718%
2018-02-26T11:01:56Jocelyn Larouchelow 4M24883209953280012---0.612--7.532%
2018-09-13T11:47:01Jocelyn Larouchelow 4M248832018629330012---0.983--8.273%
2018-10-25T11:45:57Jocelyn LaroucheManual testing248832020492263012---1.063--8.386%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:55Mark RoseManual testing258260--0.062--
2010-04-06T01:39:00Architects CubedManual testing260261--0.082--
2016-02-23T16:28:55Mark RoseManual testing261262--0.165--
2011-03-08T05:14:00GrunwalderGIMPManual testing21263--0.857--
2016-02-23T16:28:55Mark RoseManual testing262263--0.527--
2015-05-07T12:18:00snme2pm1Manual testing263264--1.054--
2015-05-07T12:18:00snme2pm1Manual testing264265--2.006--
2015-09-10T08:47:00ramgeisManual testing265266--4.011--
2018-04-30T12:03:45TJAOIManual testing266267--8.023--
2019-06-24T09:36:00TJAOIManual testing267268--16.05--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.203 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.203 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5410.020%
25500000.77346.157%
302500000.04895.333%
3510000000.00299.781%


ECM Summary

B1B2factorcurvesGHz-days
500005000030.126
500005000000573.945
50000500000010.069
50000660000019315.06


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computersB82FA12D80AA90F60.101
2015-06-27T00:56:00MadPooManual testingB82FA12D80AA90F60.101


PRP results:
dateuseridcompidcofactorsres64PRP
2019-12-03T21:03:17mrhx
98588594593976851736777
4DAF595DF785BAA8no
2019-12-04T15:50:43marssystemssystem03
98588594593976851736777
4DAF595DF785BAA8no


P-1 factor-bounds graph:
B1 = 2488320, B2 = 204922630 (P-1 stage 2)
B1 = 2488320, B2 = 186293300 (P-1 stage 2)
B1 = 2488320, B2 = 99532800 (P-1 stage 2)
B1 = 2488320, B2 = 49766400 (P-1 stage 2)
B1 = 2488320, B2 = 24883200 (P-1 stage 2)
B1 = 2488320 (P-1 stage 1)
B1 = 1244160, B2 = 12441600 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1244160 (P-1 stage 1)
B1 = 1036800 (P-1 stage 1)
B1 = 864000 (P-1 stage 1)
B1 = 720000 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
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: 2021-08-20T12:36:04+00:00