is 2 3821513 - 1
has 1150391 decimal digits
takes 0.401 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L4049F1511B044BD0double-checked
PRP89009DC994C957__
unverified PRP test

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26931.240768.1159%15000000685114521059.005214.2194%90.245972.6497%4.5337%
PrimeNet2600.040263.3333%170003400000.00533.1910%0.045564.5034%1.1700%
GPU722640.931465.6250%240004500000.00722.1654%0.938666.3693%0.7443%
Difference+5+30.3093+2.4909%+14976000+6850695210+58.9980+12.0540%+89.3073+6.2803%+3.7894%

Known prime factors (1 factor, 132.4 bits, 0.00346438% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3821513714237158730650714272959441313071828204740132.392934495262387764629183466654847271
3 × 71 × 79 × 532639 × 2418509 × 10644773 × 4049984251
2021-12-121064477340499842514.316e+1035.13662.762

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-24T04:45:00Carsten Kossendeyleela20000270000---0.005--0.859%
2011-11-02T01:55:00Squeeky_SquirrelT7500_2200650001121250---0.019--1.806%
2014-09-22T21:00:00Jocelyn LaroucheManual testing8179581795---0.012--0.683%
2016-01-31T15:29:05Jocelyn LaroucheManual testing21555621555606---0.049--2.666%
2016-02-01T12:02:04Jocelyn LaroucheManual testing25866725866706---0.059--2.862%
2020-11-22T15:32:04Carlos PinhoHomeComputer17200046470006---0.063--3.076%
2021-01-10T16:06:57axnManual testing15000000750000000---8.383--11.138%
2021-12-12T03:11:19axnManual testing15000000685114521040132.39259.010.803118.014.219%
2022-04-06T05:32:52Jocelyn LaroucheManual testing1000000147585900---1.369--7.230%
2022-07-16T15:21:55Jocelyn LaroucheManual testing38215133849900600---32.49--12.211%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:40Mark RoseManual testing21260--0.040--
2009-02-26T16:02:00S485122USB-Z260261--0.040--
2011-03-22T04:51:00markroldgamer261262--0.080--
2012-03-23T23:01:00GrunwalderGIMPManual testing21263--0.418--
2016-02-23T16:29:40Mark RoseManual testing262263--0.257--
2015-01-18T20:59:00VictordeHollanderManual testing263264--0.514--
2015-01-18T20:59:00VictordeHollanderManual testing264265--0.978--
2016-02-26T17:45:06ramgeisManual testing265266--1.955--
2016-11-17T14:52:22Gordon SpenceManual testing266267--3.911--
2018-10-01T11:53:13TJAOIManual testing267268--7.822--
2020-11-16T18:25:16TJAOIManual testing268269--15.64--


ECM factoring results:
Total ECM effort:2.851 GHz-days
Estimated T-Level:3.654
DigitsB1CompleteFacMiss
20110000.73148.154%
25500000.06893.462%
302500000.00499.574%


ECM Summary

B1B2factorcurvesGHz-days
500005000000192.851


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-11-10T00:00:00ANONYMOUSv4_computers4049F1511B044BD00.401


PRP results:
dateuseridcompidcofactorsres64PRP
2021-12-18T20:19:15Lisander ViaeneDesktop
7142371587306507142729594413130718282047
89009DC994C957__no


P-1 factor-bounds graph:
B1 = 15000000, B2 = 6851145210 (P-1 stage 2)
B1 = 3821513, B2 = 3849900600 (P-1 stage 2)
B1 = 15000000, B2 = 750000000 (P-1 stage 2)
B1 = 15000000 (P-1 stage 1)
B1 = 1000000, B2 = 147585900 (P-1 stage 2)
B1 = 3821513 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 172000, B2 = 4647000 (P-1 stage 2)
B1 = 258667, B2 = 2586670 (P-1 stage 2)
B1 = 215556, B2 = 2155560 (P-1 stage 2)
B1 = 258667 (P-1 stage 1)
B1 = 215556 (P-1 stage 1)
B1 = 172000 (P-1 stage 1)
B1 = 65000, B2 = 1121250 (P-1 stage 2)
B1 = 81795 (P-1 stage 1)
B1 = 65000 (P-1 stage 1)
B1 = 20000, B2 = 270000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-07-16T15:21:55+00:00