is 2 2876483 - 1
has 865908 decimal digits
takes 0.222 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFA0D0BB811299E4Ddouble-checked
PRP9DEF0819CC2C2B48verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26820.721467.6471%50000002000000001.74989.1812%22.471270.6174%2.9704%
PrimeNet2590.026762.7119%130002400000.00282.9978%0.029563.8297%1.1178%
GPU722630.554865.0794%160002800000.00341.8703%0.558365.7325%0.6531%
Difference+5+20.1666+2.5677%+4984000+199720000+1.7464+7.3108%+21.9130+4.8849%+4.8849%

Known prime factors (1 factor, 80.0 bits, 0.00278285% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
287648312500686336085836383743112580.048217291156180756785
32 × 5 × 17 × 284040727033669
2020-12-0917284040727033669135,7061,733,1183,236,982

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-28T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.245%
2009-07-03T00:57:00Carsten Kossendeyleela15000161250---0.003--0.724%
2010-12-23T00:29:00Jocelyn LaroucheManual testing2000020000---0.002--0.272%
2011-01-23T12:18:00Jocelyn LaroucheManual testing5000050000---0.006--0.544%
2011-09-27T20:15:00markrtiny1950004923750---0.051--3.410%
2017-06-28T04:14:52Jocelyn Larouchelow 4M39000039000006---0.065--3.559%
2019-10-23T02:43:10masserManual testing28800002880000012---0.481--6.429%
2020-03-05T14:29:39masserManual testing500000020000000012---1.750--9.181%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:23Mark RoseManual testing21260--0.053--
2009-02-13T14:58:00Sturle Sundegopher.ifi260261--0.053--
2012-01-20T12:09:00markroldgamer261262--0.107--
2013-01-10T10:24:00dbaughManual testing262263--0.341--
2015-04-21T09:21:00VictordeHollanderManual testing263264--0.683--
2015-04-21T09:21:00VictordeHollanderManual testing264265--1.299--
2016-02-19T10:39:53YxinityManual testing265266--2.598--
2017-11-12T17:07:21Gordon SpenceManual testing266267--5.196--
2019-01-10T01:22:06chuenkitManual testing267268--10.39--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.023 GHz-days
Estimated T-Level:2.400
DigitsB1CurvesCompleteFacMiss
201100048 / 1000.48061.729%
255000048 / 2800.17184.220%

New Calculation Method

Total ECM effort:5.023 GHz-days
Estimated T-Level:2.400
DigitsB1CompleteFacMiss
20110001.84615.784%
25500000.17184.297%
302500000.01198.928%


ECM Summary

B1B2factorcurvesGHz-days
500005000000454.709
50000500000030.314


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-01-13T00:00:00ANONYMOUSv4_computersFA0D0BB811299E4D0.222
1999-05-16T00:00:00ANONYMOUSv4_computersFA0D0BB811299E4D0.222
2018-09-23T05:01:41kkmrkkblmbrbkoldFA0D0BB811299E4D0.222


PRP results:
dateuseridcompidcofactorsres64PRP
2020-12-09T15:47:58mrhi
1250068633608583638374311
9DEF0819CC2C2B48no


P-1 factor-bounds graph:
B1 = 5000000, B2 = 200000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 2880000, B2 = 28800000 (P-1 stage 2)
B1 = 2880000 (P-1 stage 1)
B1 = 390000, B2 = 3900000 (P-1 stage 2)
B1 = 195000, B2 = 4923750 (P-1 stage 2)
B1 = 390000 (P-1 stage 1)
B1 = 195000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 15000, B2 = 161250 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-12-09T15:47:58+00:00