is 2 8413609 - 1
has 2532749 decimal digits
takes 2.197 GHz-days to do one PRP test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-LB1441DEB726D7D67double-checked
PRP947365BA1BC594C7

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26914.189765.2174%600000180000000.58615.3050%14.775867.0626%4.5626%
PrimeNet2640.423062.5000%340009000000.03073.1752%0.453863.6907%1.1907%
GPU722687.084364.7059%5000011000000.04062.1886%7.124965.4783%0.7725%
Difference+1+7.1054+0.5115%+550000+16900000+0.5455+3.1164%+7.6509+1.5843%+1.5843%

Known prime factors (1 factor, 70.5 bits, 0.00083831% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
841360917073920594940282755272270.532101466092582507
137 × 740628413011
2021-05-0313774062841301152.31315,27828,534

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-09-29T00:00:00ANONYMOUSv4_computers40000430000---0.023--1.410%
2012-06-28T12:26:00bcp19Toshiba-740Q1000001825000---0.073--2.530%
2021-04-30T04:33:22Kirill FrolovManual testing6000001800000012---0.586--5.305%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-05-03T03:34:28mognutsStrand600000180000008013P+12270.5320.697


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-09-20T00:00:00ANONYMOUSv4_computers?261--0.018--
1998-10-04T00:00:00ANONYMOUSv4_computers?262--0.037--
1998-12-27T00:00:00ANONYMOUSv4_computers?263--0.117--
2002-09-29T00:00:00ANONYMOUSv4_computers?264--0.233--
2014-03-18T23:24:00lycornManual testing264265--0.444--
2014-12-03T13:51:00David CampeauManual testing264265--0.444--
2015-05-25T09:22:00VictordeHollanderManual testing265266--0.888--
2016-01-06T02:55:18snme2pm1Manual testing266267--1.776--
2018-02-27T18:00:11monstManual testing267268--3.553--
2020-01-17T11:05:57TJAOIManual testing268269--7.105--


ECM factoring results:
Total ECM effort:1.191 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

ECM Summary

B1B2factorcurvesGHz-days
50000500000031.191


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-11-10T00:00:00ANONYMOUSv4_computersB1441DEB726D7D672.197
2002-10-26T00:00:00ANONYMOUSv4_computersB1441DEB726D7D672.197


PRP results:
dateuseridcompidcofactorsres64PRP
2021-05-04T12:05:04M89093871
1707392059494028275527
947365BA1BC594C7no


P-1 factor-bounds graph:
B1 = 600000, B2 = 18000000 (stage 2)
B1 = 600000 (stage 1)
B1 = 100000, B2 = 1825000 (stage 2)
B1 = 100000 (stage 1)
B1 = 40000, B2 = 430000 (stage 2)
B1 = 40000 (stage 1)
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TF factor-bounds graph:
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Last modified: 2021-05-04T12:05:04+00:00