is 2 1978597 - 1
has 595618 decimal digits
takes 0.130 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9A08255E428F20B9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.017768.6567%1000000300000000.24606.2460%15.263670.6144%1.9577%
PrimeNet2580.019463.7931%80001400000.00142.4737%0.020964.6888%0.8957%
GPU722620.310566.1290%80001000000.00121.1970%0.311766.5345%0.4054%
Difference+5+14.7072+2.5277%+992000+29900000+0.2447+5.0490%+14.9519+4.0800%+4.0800%

Known prime factors (1 factor, 81.8 bits, 0.00413353% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
197859741690190124978155010293912581.7861053529094731725435
3 × 5 × 23 × 239 × 12777018916157
2017-10-1223912777018916157386,54266,367123,955

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-13T15:19:00kurlyslice100000030000000---0.246--6.246%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-27T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:01Mark RoseManual testing258260--0.058--
2009-12-22T04:20:00S485122USB-W260261--0.078--
2016-02-23T16:29:01Mark RoseManual testing261262--0.155--
2011-09-03T15:11:00GrunwalderGIMPManual testing21263--0.807--
2016-02-23T16:29:01Mark RoseManual testing262263--0.496--
2015-03-16T20:56:00lycornManual testing263264--0.992--
2015-03-16T20:56:00lycornManual testing264265--1.888--
2015-09-10T08:47:00ramgeisManual testing265266--3.777--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.547 GHz-days
Estimated T-Level:2.050
DigitsB1CurvesCompleteFacMiss
201100041 / 1000.41066.228%
255000041 / 2800.14686.356%

New Calculation Method

Total ECM effort:3.547 GHz-days
Estimated T-Level:2.050
DigitsB1CompleteFacMiss
20110001.33826.233%
25500000.12188.579%
302500000.00799.255%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.788
50000500000010.084
50000675000070.675


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computers9A08255E428F20B90.130
2015-07-12T18:10:00MadPooManual testing9A08255E428F20B90.130


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-12T13:29:23Chang Chia-Tchehomura
4169019012497815501029391
6DC163FE7B6E67__no
2017-10-20T15:06:33Oliver KruseThreadripper
4169019012497815501029391
6DC163FE7B6E67__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
101
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105
106
101
102
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1010
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1014
TF factor-bounds graph:
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266
265
264
263
262
261
260
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2100
Last modified: 2022-04-20T02:36:57+00:00