is 2 1943857 - 1
has 585160 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-L69DAF665EE6E14B9double-checked
PRPDB3678B0EC16D0D7verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.663269.1176%19438571943857000.97778.1736%31.640971.6418%2.5242%
PrimeNet2580.019863.7931%80001400000.00122.4653%0.020964.6857%0.8926%
GPU722620.316166.1290%8000900000.00101.1523%0.317066.5193%0.3903%
Difference+6+30.3471+2.9886%+1935857+194295700+0.9767+7.0213%+31.3238+5.1225%+5.1225%

Known prime factors (1 factor, 87.9 bits, 0.00452428% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19438572980353455303068359133511592787.94676660820608282099947
32 × 101 × 10289 × 8196650423047
2021-04-2010289819665042304723,338,06235,12965,611

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-06-02T21:49:00kurlyhex100000030000000---0.203--5.694%
2018-01-28T11:49:26Jocelyn Larouchelow 4M19438573000000012---0.273--6.045%
2018-02-11T18:50:07Jocelyn Larouchelow 4M19438576000000012---0.402--6.828%
2018-03-02T12:42:18Jocelyn Larouchelow 4M194385712000000012---0.659--7.619%
2018-05-03T20:13:00Jocelyn Larouchelow 4M194385719438570012---0.978--8.174%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.059--
2010-01-25T14:14:00S485122USB-W260261--0.079--
2016-02-23T16:28:59Mark RoseManual testing261262--0.158--
2011-08-27T22:18:00GrunwalderGIMPManual testing21263--0.821--
2016-02-23T16:28:59Mark RoseManual testing262263--0.505--
2015-05-05T06:43:00lycornManual testing263264--1.010--
2015-05-05T06:44:00lycornManual testing264265--1.922--
2015-09-06T20:47:00ramgeisManual testing265266--3.844--
2017-10-27T12:33:02TJAOIManual testing266267--7.689--
2019-05-11T16:32:14chuenkitManual testing267268--15.38--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.211 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:18.211 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110008.2670.026%
25500000.74447.518%
302500000.04695.513%
3510000000.00299.790%


ECM Summary

B1B2factorcurvesGHz-days
50000500000018312.73
50000500000060.417
50000675000070.555
500007500000544.511


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computers69DAF665EE6E14B90.105
2015-07-12T18:10:00MadPooManual testing69DAF665EE6E14B90.105


PRP results:
dateuseridcompidcofactorsres64PRP
2021-04-21T14:12:52CorkZero818
298035345530306835913351159
DB3678B0EC16D0D7no


P-1 factor-bounds graph:
B1 = 1943857, B2 = 194385700 (P-1 stage 2)
B1 = 1943857, B2 = 120000000 (P-1 stage 2)
B1 = 1943857, B2 = 60000000 (P-1 stage 2)
B1 = 1943857, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1943857 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-21T11:52:05+00:00