is 2 3288209 - 1
has 989850 decimal digits
takes 0.345 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L12B469CEB8A9DA14double-checked
PRP92BC47E4F11B246Cverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26818.126967.6471%50000001000000001.54978.3700%19.676570.3550%2.7079%
PrimeNet2600.046763.3333%140002600000.00422.7767%0.050964.3514%1.0181%
GPU722641.082565.6250%170002800000.00481.6881%1.087266.2053%0.5803%
Difference+4+17.0444+2.0221%+4983000+99720000+1.5449+6.6819%+18.5893+4.1497%+4.1497%

Known prime factors (1 factor, 88.6 bits, 0.00269541% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
32882094792340154577557541029206472788.63172871586851346090547
3 × 461 × 3593 × 14664890668013
2021-03-2835931466489066801325,612,390121,677227,260

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-09T19:18:00Carsten Kossendeydurandal15000191250---0.004--0.787%
2011-09-23T19:07:00harleeP4_2600600001065000---0.017--1.939%
2014-06-26T21:22:00ANONYMOUSManual testing7951979519---0.012--0.754%
2014-10-10T20:28:00Jocelyn LaroucheManual testing9903899038---0.015--0.861%
2016-01-26T11:58:36Jocelyn LaroucheManual testing38340038340006---0.087--3.600%
2021-03-30T10:34:57riccardo ubertiColab_noGPU14500000010000000012---1.550--8.370%
2022-03-24T08:46:59Jocelyn LaroucheManual testing1000000134316000---1.258--7.652%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-06-07T00:00:00ANONYMOUSv4_computers21260--0.047--
2009-04-02T04:52:00S485122USB-A260261--0.047--
2011-09-26T13:32:00markroldgamer261262--0.093--
2012-12-30T00:06:00dbaughManual testing262263--0.299--
2015-02-07T18:05:00VictordeHollanderManual testing263264--0.597--
2015-02-07T18:05:00VictordeHollanderManual testing264265--1.136--
2015-06-29T20:47:00ThaManual testing265266--2.273--
2017-04-07T14:00:46Gordon SpenceManual testing266267--4.545--
2018-11-19T15:52:50TJAOIManual testing267268--9.090--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.113 GHz-days
Estimated T-Level:1.700
DigitsB1CurvesCompleteFacMiss
201100034 / 1000.34071.055%
255000034 / 2800.12188.546%

New Calculation Method

Total ECM effort:5.113 GHz-days
Estimated T-Level:1.700
DigitsB1CompleteFacMiss
20110001.11232.879%
25500000.10190.405%
302500000.00699.380%


ECM Summary

B1B2factorcurvesGHz-days
500005000000223.205
50000500000050.728
50000675000071.180


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-28T00:00:00ANONYMOUSv4_computers12B469CEB8A9DA140.345
1999-06-26T00:00:00Smegheadsv4_computers12B469CEB8A9DA140.345


PRP results:
dateuseridcompidcofactorsres64PRP
2021-03-29T14:42:52Chad SteenersonLaura072713
479234015457755754102920647
92BC47E4F11B246Cno


P-1 factor-bounds graph:
B1 = 5000000, B2 = 100000000 (P-1 stage 2)
B1 = 1000000, B2 = 134316000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 383400, B2 = 3834000 (P-1 stage 2)
B1 = 383400 (P-1 stage 1)
B1 = 60000, B2 = 1065000 (P-1 stage 2)
B1 = 99038 (P-1 stage 1)
B1 = 79519 (P-1 stage 1)
B1 = 60000 (P-1 stage 1)
B1 = 15000, B2 = 191250 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-24T08:46:59+00:00