is 2 238081 - 1
has 71670 decimal digits
takes 0.001 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actualunknown30000000101202470268904,486.311472.8891%4,486.311472.8891%72.8891%
PrimeNet2400.000055.0000%2600650000.000013.9171%0.000061.2627%6.2627%
GPU722440.000059.0909%45001000000.00019.8885%0.000163.1362%4.0453%
Difference-440.0000-59.0909%+29995500+10120246926890+4,486.3113+63.0007%+4,486.3113+9.7529%+9.7529%

Known prime factors (2 factors, 107.1 bits, 0.04497757% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
23808118570319824.14639
3 × 13
-3139.467e-122.884e-84.968e-8
23808192553236035295981289660792582.93719437341920458999519
3 × 23 × 281700607542884051
2020-05-26232817006075428840515,537,880124,871,619233,225,410

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
23808117187431176577416319670322720920133107.083
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2021-07-14T07:57:06Oliver KruseOllaptop30000000300000000024-
skipped known factor: 18570319
--1.561--43.920%
2022-04-03T11:58:42Oliver KruseThreadripper-PC3000000010120247026890-
skipped known factor: 18570319
--4,486--63.021%


Trial Factoring results:
No TF results for M238081


ECM factoring results:

Old Calculation Method

Total ECM effort:10.690 GHz-days
Estimated T-Level:27.313
DigitsB1CurvesCompleteFacMiss
2011000600 / 1006.0000.241%
2550000570 / 2802.03613.011%
30250000296 / 6400.46362.948%

New Calculation Method

Total ECM effort:10.690 GHz-days
Estimated T-Level:27.313
DigitsB1CompleteFacMiss
201100033.5120.000%
25500004.3991.228%
302500000.43864.526%
3510000000.03596.597%
4030000000.00299.775%


ECM Summary

B1B2factorcurvesGHz-days
110001100000300.039
5000050000002741.636
250000250000002607.760
2500002500000010.030
2500003625000070.240
25000038500000280.985


Lucas-Lehmer results:
No L-L results for M238081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-22T05:44:55Oliver KruseOllaptop
18570319
BE9124D273093E__no
2017-09-22T10:05:21Oliver KruseManual testing
18570319
BE9124D273093E__no
2017-10-12T15:48:43kkmrkkblmbrbkc4.xlargeBE9124D273093E__no
2020-04-17T20:09:21Oliver KruseAddPrpType5
18570319
0F07C403DCB42E__no
2020-05-26T21:10:39CrypticCluecruncher
18570319
9255323603529598128966079
0F07C403DCB42E1Cno


P-1 factor-bounds graph:
B1 = 30000000, B2 = 10120247026890 (P-1 stage 2)
B1 = 30000000, B2 = 3000000000 (P-1 stage 2)
B1 = 30000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-17T19:17:32+00:00