is 2 3811373 - 1
has 1147338 decimal digits
takes 0.400 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRPF1D9C383EE4889__verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26931.323868.1159%150000007500000008.382811.1360%39.706671.6665%3.5506%
PrimeNet2600.040363.3333%170003400000.00533.1895%0.045664.5028%1.1695%
GPU722640.933965.6250%240004500000.00722.1643%0.941166.3690%0.7440%
Difference+5+30.3900+2.4909%+14976000+749550000+8.3756+8.9716%+38.7656+5.2975%+5.2975%

Known prime factors (1 factor, 70.0 bits, 0.00183777% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
381137312174989775124693384312270.044159719211096955
5 × 241 × 132547063151
2021-10-0824113254706315174.8481,099.82,054.1

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-12T19:22:00Carsten Kossendeyleela20000270000---0.005--0.859%
2011-11-04T18:10:00Squeeky_SquirrelT7500_2200650001121250---0.019--1.805%
2014-09-19T20:39:00Jocelyn LaroucheManual testing8184081840---0.012--0.682%
2016-01-28T01:44:16Jocelyn LaroucheManual testing22239322239306---0.050--2.698%
2016-08-13T16:36:13Jocelyn LaroucheManual testing22239344478606---0.069--3.177%
2020-12-28T16:15:40axnManual testing15000000750000000---8.383--11.136%
2022-03-03T20:34:46Jocelyn LaroucheManual testing9000090000---0.014--0.724%
2022-03-22T11:09:31Jocelyn LaroucheManual testing100000100000---0.015--0.771%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:40Mark RoseManual testing21260--0.040--
2009-03-01T14:47:00S485122USB-A260261--0.040--
2011-03-06T23:07:00markrManual testing261262--0.081--
2012-02-29T05:40:00GrunwalderGIMPManual testing21263--0.419--
2016-02-23T16:29:40Mark RoseManual testing262263--0.258--
2015-01-18T20:59:00VictordeHollanderManual testing263264--0.515--
2015-01-18T20:59:00VictordeHollanderManual testing264265--0.980--
2016-02-26T10:03:27ramgeisManual testing265266--1.961--
2016-11-17T14:52:20Gordon SpenceManual testing266267--3.921--
2018-10-15T12:54:48TJAOIManual testing267268--7.843--
2020-11-30T17:52:53axnManual testing268269--15.69--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.249 GHz-days
Estimated T-Level:0.750
DigitsB1CurvesCompleteFacMiss
201100015 / 1000.15086.006%
255000015 / 2800.05494.775%

New Calculation Method

Total ECM effort:2.249 GHz-days
Estimated T-Level:0.750
DigitsB1CompleteFacMiss
20110000.48461.639%
25500000.04495.721%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.800
50000500000030.450


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-02-01T00:00:00ANONYMOUSv4_computers8193186D23D524__0.400


PRP results:
dateuseridcompidcofactorsres64PRP
2021-10-16T23:05:33LaurVtrabi
1217498977512469338431
F1D9C383EE4889__no


P-1 factor-bounds graph:
B1 = 15000000, B2 = 750000000 (P-1 stage 2)
B1 = 15000000 (P-1 stage 1)
B1 = 222393, B2 = 4447860 (P-1 stage 2)
B1 = 222393, B2 = 2223930 (P-1 stage 2)
B1 = 222393 (P-1 stage 1)
B1 = 65000, B2 = 1121250 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 81840 (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: 2022-03-22T11:09:31+00:00