is 2 1984183 - 1
has 597299 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-L8CF177F9A3EFEB9Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.975468.6567%1000000300000000.24606.2480%15.221470.6150%1.9583%
PrimeNet2580.019463.7931%80001400000.00142.4751%0.020864.6892%0.8961%
GPU722620.309666.1290%80001000000.00121.1977%0.310966.5347%0.4057%
Difference+5+14.6658+2.5277%+992000+29900000+0.2447+5.0502%+14.9105+4.0803%+4.0803%

Known prime factors (1 factor, 70.8 bits, 0.00356860% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
198418320661957500273546025292270.807520666629546608
24 × 32541664346663
2015-06-231632541664346663212.98169,030315,700

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-22T15:55:00kurlyhex100000030000000---0.246--6.248%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-27T00:00:00Brap_Onv4_computers21258--0.019--
2009-12-16T23:24:00S485122USB-W260261--0.077--
2011-07-01T19:06:00GrunwalderGIMPManual testing21263--0.804--
2015-03-13T07:58:00lycornManual testing263264--0.989--
2015-03-13T07:59:00lycornManual testing264265--1.883--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.552 GHz-days
Estimated T-Level:1.950
DigitsB1CurvesCompleteFacMiss
201100039 / 1000.39067.573%
255000039 / 2800.13986.976%

New Calculation Method

Total ECM effort:3.552 GHz-days
Estimated T-Level:1.950
DigitsB1CompleteFacMiss
20110001.31326.890%
25500000.11988.787%
302500000.00799.268%


ECM Summary

B1B2factorcurvesGHz-days
500005000000151.268
50000500000030.254
500006750000141.350
50000686425370.681


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00Brap_Onv4_computers8CF177F9A3EFEB9D0.130


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:24:43alpertronManual testing
2066195750027354602529
66558944257265__no
2017-10-20T14:05:35Oliver KruseThreadripper
2066195750027354602529
66558944257265__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-23T22:32:48+00:00