is 2 3892741 - 1
has 1171832 decimal digits
takes 0.486 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- L-L tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2677.633267.1642%38927438927410.10494.0992%7.738168.5102%1.3460%
PrimeNet2600.039563.3333%170003600000.00653.2466%0.045964.5238%1.1904%
GPU722640.914465.6250%240005000000.00902.2326%0.923466.3925%0.7675%
Difference+3+6.7188+1.5392%+365274+3392741+0.0959+1.8665%+6.8147+2.1177%+2.1177%

Known prime factors (2 factors, 102.9 bits, 0.00264346% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
389274123356447824.4773
3
-135.745e-132.006e-73.681e-7
38927414059695623238842785429432478.42652144435286586531
32 × 7 × 47 × 71 × 7853 × 31584617
2021-07-1978533158461730,8080.31250.5812

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
3892741948200656603099998592148540352131102.903
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2020-11-05T21:00:41Jocelyn LaroucheManual testing38927438927416---0.105--4.099%
2020-11-07T12:28:38Jocelyn LaroucheManual testing389274389274---0.070--2.008%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-07-19T23:55:15ATHec2-P_1100000010000000027P-12478.4261.037


Trial Factoring results:
Exponent "3892741" not found


ECM factoring results:

Old Calculation Method

Total ECM effort:0.537 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.537 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.09790.776%
25500000.00999.129%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.537


Lucas-Lehmer results:
Exponent "3892741" not found


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T16:57:51kkmrkkblmbrbkManual testing
23356447
91D22A4814643A__no
2017-12-27T14:44:57Oliver KruseGTX-1
23356447
91D22A4814643A__no
2021-07-20T03:12:21ATHec2-PRPCFDC
23356447
405969562323884278542943
6AA3FE3A2BBAF48Fno


P-1 factor-bounds graph:
B1 = 1000000, B2 = 100000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 389274, B2 = 3892741 (P-1 stage 2)
B1 = 389274 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-07-20T03:12:21+00:00