is 2 2148989 - 1
has 646911 decimal digits
takes 0.141 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L526547CC798EAEA5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26827.736267.6471%25000001250000000.87467.9165%28.610970.2083%2.5612%
PrimeNet2580.017962.0690%90001700000.00172.7335%0.019663.1058%1.0368%
GPU722620.285964.5161%100001600000.00171.5177%0.287665.0547%0.5385%
Difference+6+27.4504+3.1309%+2490000+124840000+0.8729+6.3989%+28.3233+5.1536%+5.1536%

Known prime factors (1 factor, 83.3 bits, 0.00387517% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2148989117179517230171300437919992683.2772726387087839242091
11 × 247853371621749281
2020-07-15112478533716217492811,130,7691.287e+92.405e+9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-07T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.225%
2010-11-03T21:25:00Jocelyn LaroucheManual testing2000020000---0.002--0.254%
2010-12-30T22:20:00Jocelyn LaroucheManual testing3000030000---0.003--0.353%
2011-01-13T23:58:00Jocelyn LaroucheManual testing5000050000---0.005--0.513%
2011-01-22T07:14:00James Heinrichi7-9201350002666250---0.026--2.681%
2016-04-29T05:18:09Jocelyn LaroucheManual testing270000995900612---0.076--3.982%
2017-10-04T07:45:21Jocelyn Larouchelow 4M54000054000006---0.077--3.829%
2017-11-17T22:14:10Jocelyn Larouchelow 4M6480001095490612---0.115--4.546%
2017-11-30T11:38:55mikrMSI250000012500000012---0.875--7.917%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00pyropunkv4_computers21258--0.018--
2000-03-08T00:00:00pyropunkv4_computers21258--0.018--
2016-02-23T16:29:07Mark RoseManual testing258260--0.054--
2009-01-04T21:14:00Sturle Sundegolan.ifi260261--0.071--
2009-01-07T09:16:00Sturle Sundejodel.ifi261262--0.143--
2013-09-07T11:35:00ramgeisManual testing262263--0.457--
2015-03-18T10:56:00VictordeHollanderManual testing263264--0.914--
2015-03-18T10:56:00VictordeHollanderManual testing264265--1.739--
2015-12-30T18:01:32ramgeisManual testing265266--3.477--
2016-10-29T15:24:12Gordon SpenceManual testing266267--6.955--
2019-04-08T13:40:41TJAOIManual testing267268--13.91--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.449 GHz-days
Estimated T-Level:4.950
DigitsB1CurvesCompleteFacMiss
201100099 / 1000.99036.973%
255000099 / 2800.35470.173%

New Calculation Method

Total ECM effort:8.449 GHz-days
Estimated T-Level:4.950
DigitsB1CompleteFacMiss
20110003.1944.103%
25500000.28974.929%
302500000.01898.238%


ECM Summary

B1B2factorcurvesGHz-days
500005000000968.193
50000500000030.256


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14T00:00:00pyropunkv4_computers526547CC798EAEA50.141
2000-03-08T00:00:00pyropunkv4_computers526547CC798EAEA50.141
2018-04-08T22:57:24kkmrkkblmbrbkold526547CC798EAEA50.141


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-16T02:22:11CrypticClueManual testing
11717951723017130043791999
3B74C2823424512Ano
2020-07-16T03:53:28oodairacom2
11717951723017130043791999
3B74C2823424512Ano


P-1 factor-bounds graph:
B1 = 2500000, B2 = 125000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 648000, B2 = 10954906 (P-1 stage 2)
B1 = 540000, B2 = 5400000 (P-1 stage 2)
B1 = 270000, B2 = 9959006 (P-1 stage 2)
B1 = 648000 (P-1 stage 1)
B1 = 540000 (P-1 stage 1)
B1 = 135000, B2 = 2666250 (P-1 stage 2)
B1 = 270000 (P-1 stage 1)
B1 = 135000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 20000 (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: 2020-07-16T03:53:28+00:00