is 2 1983931 - 1
has 597223 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-L22234BCAD3898B8Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.043869.1176%19839312479913751.46708.4878%31.510871.7389%2.6212%
PrimeNet2580.019463.7931%80001400000.00142.4750%0.020864.6892%0.8961%
GPU722620.309766.1290%80001000000.00121.1977%0.310966.5347%0.4057%
Difference+6+29.7342+2.9886%+1975931+247891375+1.4657+7.2901%+31.1999+5.2042%+5.2042%

Known prime factors (1 factor, 73.3 bits, 0.00369593% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1983931118287124371423341605132373.3252981129998256576
26 × 5387 × 8646771157
2020-01-31538786467711571,802.444.91483.886

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-21T15:33:00kurlyhex100000030000000---0.246--5.707%
2018-01-21T01:09:50Jocelyn Larouchelow 4M12057601205760---0.115--2.562%
2018-01-27T10:55:55Jocelyn Larouchelow 4M19839313000000012---0.335--6.068%
2018-02-15T13:14:27Jocelyn Larouchelow 4M19839316000000012---0.490--6.855%
2018-03-11T02:36:11Jocelyn Larouchelow 4M198393112000000012---0.802--7.650%
2018-05-21T11:06:49Jocelyn Larouchelow 4M198393119839310012---1.209--8.230%
2018-11-26T12:53:52Jocelyn LaroucheManual testing198393124799137512---1.467--8.488%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2006-02-15T00:00:00ANONYMOUSv4_computers21258--0.019--
2007-11-17T00:00:00ANONYMOUSv4_computers21258--0.019--
1998-12-27T00:00:00petrymv4_computers21258--0.019--
2016-02-23T16:29:02Mark RoseManual testing258260--0.058--
2009-12-17T06:38:00S485122USB-W260261--0.077--
2016-02-23T16:29:02Mark RoseManual testing261262--0.155--
2011-08-27T22:55:00GrunwalderGIMPManual testing21263--0.804--
2016-02-23T16:29:02Mark RoseManual testing262263--0.495--
2015-03-13T07:58:00lycornManual testing263264--0.990--
2015-03-13T07:59:00lycornManual testing264265--1.883--
2015-09-11T08:33:00ramgeisManual testing265266--3.767--
2018-01-08T13:22:29TJAOIManual testing266267--7.533--
2019-05-18T12:32:08chuenkitManual testing267268--15.07--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.915 GHz-days
Estimated T-Level:3.500
DigitsB1CurvesCompleteFacMiss
201100070 / 1000.70049.484%
255000070 / 2800.25077.845%

New Calculation Method

Total ECM effort:5.915 GHz-days
Estimated T-Level:3.500
DigitsB1CompleteFacMiss
20110002.25810.455%
25500000.20481.540%
302500000.01398.751%


ECM Summary

B1B2factorcurvesGHz-days
500005000000695.831
50000500000010.085


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00petrymv4_computers22234BCAD3898B8D0.130
2006-02-15T00:00:00ANONYMOUSv4_computers22234BCAD3898B8D0.130
2007-11-17T00:00:00ANONYMOUSv4_computers22234BCAD3898B8D0.130
2016-06-02T10:53:05MadPooManual testing22234BCAD3898B8D0.130


PRP results:
dateuseridcompidcofactorsres64PRP
2020-02-01T08:07:14Niels_Mache_NextcloudSuperDry-X
11828712437142334160513
FA44C77AB96DDEF2no
2020-02-02T03:06:59ANONYMOUSdory
11828712437142334160513
FA44C77AB96DDEF2no
2020-02-07T18:50:57GANKL-SCH06
11828712437142334160513
FA44C77AB96DDEF2no


P-1 factor-bounds graph:
B1 = 1983931, B2 = 247991375 (P-1 stage 2)
B1 = 1983931, B2 = 198393100 (P-1 stage 2)
B1 = 1983931, B2 = 120000000 (P-1 stage 2)
B1 = 1983931, B2 = 60000000 (P-1 stage 2)
B1 = 1983931, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1983931 (P-1 stage 1)
B1 = 1205760 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-02-07T18:50:57+00:00