is 2 3760039 - 1
has 1131885 decimal digits
takes 0.395 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP561E3CF93242ECD0verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27063.550068.5714%1600000660000000.77806.1504%64.328070.5044%1.9330%
PrimeNet2600.040863.3333%170003400000.00533.1821%0.046164.5001%1.1668%
GPU722640.946665.6250%220004500000.00692.1117%0.953566.3509%0.7259%
Difference+6+62.6034+2.9464%+1578000+65550000+0.7711+4.0387%+63.3745+4.1535%+4.1535%

Known prime factors (1 factor, 80.0 bits, 0.00212665% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
376003911782910022828254080800172579.963156686008081674872
23 × 23 × 851554391748233
2021-08-182385155439174823361,5437,065,51213,196,409

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-11T19:29:00Carsten Kossendeydurandal20000265000---0.005--0.730%
2013-03-19T11:46:00Squeeky_SquirrelP4_26001100002035000---0.033--2.077%
2016-01-06T23:47:35mikrMSI16000006600000012---0.778--6.150%
2022-03-03T20:38:13Jocelyn LaroucheManual testing9000090000---0.014--0.624%
2022-03-22T17:33:38Jocelyn LaroucheManual testing100000100000---0.015--0.666%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:38Mark RoseManual testing21260--0.041--
2009-03-02T16:31:00S485122USB-Z260261--0.041--
2011-05-07T04:17:00markroldgamer261262--0.082--
2012-04-21T16:42:00GrunwalderGIMPManual testing21263--0.424--
2016-02-23T16:29:38Mark RoseManual testing262263--0.261--
2015-01-25T20:42:00VictordeHollanderManual testing263264--0.522--
2015-01-25T20:42:00VictordeHollanderManual testing264265--0.994--
2016-02-28T22:17:32ramgeisManual testing265266--1.987--
2016-11-08T02:48:18Gordon SpenceManual testing266267--3.975--
2019-01-28T14:25:37TJAOIManual testing267268--7.950--
2019-02-08T06:02:18YxinityManual testing267268--7.950--
2020-12-05T12:48:43axnManual testing268269--15.90--
2021-03-27T01:50:22axnManual testing269270--31.80--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.944 GHz-days
Estimated T-Level:0.650
DigitsB1CurvesCompleteFacMiss
201100013 / 1000.13087.752%
255000013 / 2800.04695.455%

New Calculation Method

Total ECM effort:1.944 GHz-days
Estimated T-Level:0.650
DigitsB1CompleteFacMiss
20110000.41965.747%
25500000.03896.281%
302500000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.795
50000500000010.150


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-04-19T00:00:00ANONYMOUSv4_computers1E5BEF4F1D7279__0.395


PRP results:
dateuseridcompidcofactorsres64PRP
2021-08-18T18:44:31SRJ2877LTOS
1178291002282825408080017
561E3CF93242ECD0no


P-1 factor-bounds graph:
B1 = 1600000, B2 = 66000000 (P-1 stage 2)
B1 = 1600000 (P-1 stage 1)
B1 = 110000, B2 = 2035000 (P-1 stage 2)
B1 = 110000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 20000, B2 = 265000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-22T17:33:38+00:00