is 2 3817783 - 1
has 1149268 decimal digits
takes 0.401 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9CF6BF73C02A49E1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26815.612467.6471%1000001303648501.09615.4297%16.708569.4037%1.7567%
PrimeNet2600.040263.3333%170003400000.00533.1904%0.045564.5032%1.1698%
GPU722640.932365.6250%240004500000.00722.1650%0.939566.3692%0.7442%
Difference+4+14.6801+2.0221%+76000+129914850+1.0889+3.2647%+15.7690+3.0345%+3.0345%

Known prime factors (1 factor, 81.2 bits, 0.00212591% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
381778327061820105041922214115932581.163354417997369702812
22 × 3 × 7 × 13 × 1151 × 281979674761
2017-08-301151281979674761181,9202,339.64,369.8

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-24T04:43:00Carsten Kossendeyleela20000270000---0.005--0.999%
2011-11-02T22:13:00Squeeky_SquirrelT7500_2200650001121250---0.019--2.050%
2014-09-22T21:00:00Jocelyn LaroucheManual testing8181281812---0.012--0.790%
2016-01-31T15:29:04Jocelyn LaroucheManual testing25872425872406---0.059--3.190%
2016-01-31T15:29:07Jocelyn LaroucheManual testing31046831046806---0.070--3.409%
2022-03-05T00:34:48Jocelyn LaroucheManual testing9000090000---0.014--0.836%
2022-03-22T17:33:31Jocelyn LaroucheManual testing100000100000---0.015--0.890%
2022-05-24T23:56:34Jocelyn LaroucheManual testing100000130364850---1.096--5.430%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:40Mark RoseManual testing21260--0.040--
2009-02-26T08:00:00S485122USB-Z260261--0.040--
2011-03-14T12:15:00markroldgamer261262--0.080--
2012-03-23T23:24:00GrunwalderGIMPManual 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--0.979--
2016-02-26T10:03:28ramgeisManual testing265266--1.957--
2016-11-17T14:52:21Gordon SpenceManual testing266267--3.915--
2022-03-22T17:39:49Jocelyn LaroucheManual testing267268--7.829--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.800 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

New Calculation Method

Total ECM effort:1.800 GHz-days
Estimated T-Level:0.600
DigitsB1CompleteFacMiss
20110000.38767.903%
25500000.03596.562%
302500000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.350
50000500000030.450


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-07T00:00:00ANONYMOUSv4_computers9CF6BF73C02A49E10.401


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:10:10alpertronManual testing
2706182010504192221411593
772AE14C491398__no
2017-12-11T20:43:31kkmrkkblmbrbkc4.xlarge
2706182010504192221411593
772AE14C491398__no


P-1 factor-bounds graph:
B1 = 100000, B2 = 130364850 (P-1 stage 2)
B1 = 310468, B2 = 3104680 (P-1 stage 2)
B1 = 258724, B2 = 2587240 (P-1 stage 2)
B1 = 310468 (P-1 stage 1)
B1 = 258724 (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 = 81812 (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: 2022-05-24T23:56:34+00:00