is 2 393541 - 1
has 118468 decimal digits
takes 0.004 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L20F044748F5D90DAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26775.504071.6418%100000100000000.00902.9030%75.513072.4650%0.8232%
PrimeNet2400.000052.5000%40001200000.000117.2667%0.000160.7017%8.2017%
GPU722440.000056.8182%70002000000.000212.8193%0.000362.3538%5.5356%
Difference+23+75.5040+14.8236%+93000+9800000+0.0087-9.9163%+75.5127+10.1112%+10.1112%

Known prime factors (1 factor, 71.8 bits, 0.01824951% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
39354141664050017844783398492271.8195293482765181364
22 × 13 × 101797745484257
2009-09-05131017977454842572,425.977,963145,613

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-10-13T00:00:00ANONYMOUSv4_computers10000010000000---0.009--2.903%
2002-06-15T00:00:00ANONYMOUSv4_computers327683276800---0.003--1.684%
2002-08-24T00:00:00ANONYMOUSv4_computers655366553600---0.006--2.402%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-12-01T00:00:00ANONYMOUSv4_computers252253--0.002--
2000-04-27T00:00:00ANONYMOUSv4_computers21254--0.006--
2022-03-07T06:43:17LordJuliusManual testing254255--0.006--
2001-03-11T00:00:00ANONYMOUSv4_computers21256--0.024--
2002-01-22T00:00:00ANONYMOUSv4_computers21257--0.049--
2004-01-18T00:00:00ANONYMOUSv4_computers21258--0.098--
2008-12-29T02:39:00Sturle Sundegicy.ifi258259--0.098--
2009-01-04T21:08:00Sturle Sundenouchcraft.ifi259260--0.195--


ECM factoring results:

Old Calculation Method

Total ECM effort:10.514 GHz-days
Estimated T-Level:26.125
DigitsB1CurvesCompleteFacMiss
2011000423 / 1004.2301.425%
2550000423 / 2801.51122.016%
30250000144 / 6400.22579.838%

New Calculation Method

Total ECM effort:10.514 GHz-days
Estimated T-Level:26.125
DigitsB1CompleteFacMiss
201100023.8220.000%
25500003.0214.875%
302500000.28775.083%
3510000000.02297.834%
4030000000.00199.860%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002792.936
250000250000001447.578


Lucas-Lehmer results:
No L-L results for M393541


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-23T07:53:20Oliver KruseOllaptop
4166405001784478339849
6A9B5AB3547F72__no
2017-11-02T11:39:30kkmrkkblmbrbkc4.xlarge
4166405001784478339849
6A9B5AB3547F72__no
2020-04-18T15:55:33Oliver KruseAddPrpType5
4166405001784478339849
FC5D536C612170__no


P-1 factor-bounds graph:
B1 = 100000, B2 = 10000000 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-07T06:43:17+00:00