is 2 1842887 - 1
has 554765 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-LDFD0F0B1ADC8757Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26832.343269.1176%18428871842887000.92698.0281%33.270171.5969%2.4793%
PrimeNet2570.010463.1579%80001500000.00122.8829%0.011764.2200%1.0621%
GPU722610.166765.5738%90001400000.00131.5969%0.168066.1235%0.5497%
Difference+7+32.1765+3.5439%+1833887+184148700+0.9256+6.4312%+33.1021+5.4734%+5.4734%

Known prime factors (1 factor, 68.7 bits, 0.00372678% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18428874729706105996664133692168.680128323280428932
22 × 3 × 47797 × 223729663
2019-11-254779722372966346.7510.96241.7909

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-12-31T23:33:00markrtiny2750006000000---0.046--3.530%
2015-10-06T21:30:16Bruno Victal5820K-linux5000001500000012---0.101--4.603%
2016-10-27T15:20:23Jocelyn Larouchelow 4M660000660000---0.052--1.999%
2016-10-29T20:53:42Jocelyn Larouchelow 4M792000792000---0.062--2.154%
2016-11-03T20:53:44Jocelyn Larouchelow 4M11404801140480---0.090--2.484%
2017-03-21T00:47:12Jocelyn Larouchelow 4M13685761368576012---0.160--5.010%
2018-01-31T13:05:36Jocelyn Larouchelow 4M18428871368576012---0.196--5.120%
2018-02-04T16:40:55Jocelyn Larouchelow 4M18428872737152012---0.254--5.884%
2018-02-10T10:46:30Jocelyn Larouchelow 4M18428875474304012---0.372--6.656%
2018-02-27T12:51:00Jocelyn Larouchelow 4M184288710948608012---0.606--7.437%
2018-05-03T20:13:00Jocelyn Larouchelow 4M184288718428870012---0.927--8.028%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:54Mark RoseManual testing258260--0.063--
2010-04-08T13:18:00Architects CubedManual testing260261--0.083--
2016-02-23T16:28:54Mark RoseManual testing261262--0.167--
2011-01-21T16:11:00GrunwalderGIMPManual testing21263--0.866--
2016-02-23T16:28:54Mark RoseManual testing262263--0.533--
2015-04-27T21:09:00snme2pm1Manual testing263264--1.065--
2015-04-27T21:09:00snme2pm1Manual testing264265--2.027--
2015-09-06T20:47:00ramgeisManual testing265266--4.055--
2017-12-04T13:35:48TJAOIManual testing266267--8.110--
2019-06-24T09:36:01TJAOIManual testing267268--16.22--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.068 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.068 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5310.020%
25500000.77346.179%
302500000.04895.334%
3510000000.00299.781%


ECM Summary

B1B2factorcurvesGHz-days
500005000000543.733
50000500000020.138
50000660000019515.20


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00Ethan O'Connorv4_computersDFD0F0B1ADC8757C0.100
2015-06-27T00:56:00MadPooManual testingDFD0F0B1ADC8757C0.100


PRP results:
dateuseridcompidcofactorsres64PRP
2019-11-26T20:15:25Niels_Mache_NextcloudSuperDry-X
472970610599666413369
C5D4AE511C785F4Eno
2019-11-27T16:19:37marssystemssystem03
472970610599666413369
C5D4AE511C785F4Eno


P-1 factor-bounds graph:
B1 = 1842887, B2 = 184288700 (P-1 stage 2)
B1 = 1842887, B2 = 109486080 (P-1 stage 2)
B1 = 1842887, B2 = 54743040 (P-1 stage 2)
B1 = 1842887, B2 = 27371520 (P-1 stage 2)
B1 = 1842887, B2 = 13685760 (P-1 stage 2)
B1 = 1368576, B2 = 13685760 (P-1 stage 2)
B1 = 1842887 (P-1 stage 1)
B1 = 1368576 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1140480 (P-1 stage 1)
B1 = 792000 (P-1 stage 1)
B1 = 660000 (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: 2021-06-11T13:30:20+00:00