is 2 1840789 - 1
has 554133 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3A4618729467BD48double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26832.380169.1176%18407891840789000.92588.0250%33.305971.5959%2.4783%
PrimeNet2570.010463.1579%80001500000.00122.8823%0.011764.2198%1.0619%
GPU722610.166965.5738%90001400000.00131.5965%0.168166.1234%0.5496%
Difference+7+32.2132+3.5439%+1831789+183938900+0.9246+6.4285%+33.1378+5.4726%+5.4726%

Known prime factors:
No known factors for M1840789

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-09T06:19:00Carsten Kossendeyleela1000001675000---0.015--2.212%
2014-05-19T21:00:00Jocelyn LaroucheManual testing134868134868---0.011--0.925%
2014-09-23T20:52:00Jocelyn LaroucheManual testing169736169736---0.013--1.050%
2015-07-09T11:40:00mikrMSI278000091760000---0.600--7.494%
2018-08-09T11:43:49Jocelyn Larouchelow 4M184078918407890012---0.926--8.025%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:54Mark RoseManual testing258260--0.063--
2010-04-08T13:17:00Architects CubedManual testing260261--0.083--
2016-02-23T16:28:54Mark RoseManual testing261262--0.167--
2011-01-21T16:11:00GrunwalderGIMPManual testing21263--0.867--
2016-02-23T16:28:54Mark RoseManual testing262263--0.533--
2015-04-27T21:09:00snme2pm1Manual testing263264--1.067--
2015-04-27T21:09:00snme2pm1Manual testing264265--2.030--
2015-09-06T20:47:00ramgeisManual testing265266--4.060--
2017-12-18T13:17:37TJAOIManual testing266267--8.119--
2019-06-24T09:36:02TJAOIManual testing267268--16.24--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.290 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:18.290 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
201100010.0900.004%
25500000.93239.364%
302500000.05994.281%
3510000000.00399.725%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020614.24
500006600000524.052


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21T00:00:00ANONYMOUSv4_computers3A4618729467BD480.100
2015-06-27T00:55:00MadPooManual testing3A4618729467BD480.100


PRP results:
No PRP results for M1840789


P-1 factor-bounds graph:
B1 = 1840789, B2 = 184078900 (P-1 stage 2)
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 1840789 (P-1 stage 1)
B1 = 100000, B2 = 1675000 (P-1 stage 2)
B1 = 169736 (P-1 stage 1)
B1 = 134868 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-05-21T15:33:05+00:00