is 2 2018543 - 1
has 607642 decimal digits
takes 0.133 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L75250110257E14FCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.720568.6567%580000150800000.13065.2223%14.851170.2936%1.6368%
PrimeNet2580.019063.7931%90001500000.00162.6116%0.020664.7387%0.9456%
GPU722620.304466.1290%80001200000.00131.2731%0.305766.5602%0.4312%
Difference+5+14.4161+2.5277%+572000+14960000+0.1293+3.9492%+14.5454+3.7333%+1.2056%

Known prime factors (1 factor, 77.3 bits, 0.00383101% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20185431900350504629745661131132477.33147072331494294292
22 × 32 × 2213983 × 590593859
2017-11-06221398359059385920,3233.26735.7296

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-04-28T00:00:00Jocelyn Larouchev4_computers20002000---0.000--0.022%
2002-05-05T00:00:00Jocelyn Larouchev4_computers30003000---0.000--0.040%
2003-02-02T00:00:00ANONYMOUSv4_computers30000547500---0.006--1.426%
2010-12-07T03:13:00Jocelyn LaroucheManual testing201854201854---0.019--1.332%
2013-10-16T20:08:00David Campeaui5-2500k58000015080000---0.131--5.222%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:03Mark RoseManual testing258260--0.057--
2009-01-02T09:30:00Sturle Sundefigaro.ifi260261--0.076--
2012-02-04T09:47:00Sebastian HornbostelManual testing261262--0.152--
2013-02-11T20:23:00dbaughManual testing262263--0.486--
2015-03-15T12:12:00VictordeHollanderManual testing263264--0.973--
2015-03-15T12:12:00VictordeHollanderManual testing264265--1.851--
2015-10-28T09:42:37ramgeisManual testing265266--3.702--
2016-07-16T16:15:45Gordon SpenceManual testing266267--7.404--


ECM factoring results:
Total ECM effort:4.506 GHz-days
Estimated T-Level:20.937
DigitsB1CompleteFacMiss
20110002.02213.233%
25500000.18782.904%
302500000.01298.823%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.794
500005000000121.016
50000715000070.696


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00ANONYMOUSv4_computers75250110257E14FC0.133
2016-07-15T12:24:29Mark Roseleonardo75250110257E14FC0.133


PRP results:
dateuseridcompidcofactorsres64PRP
2017-11-07T07:27:10Oliver KruseGTX-2
190035050462974566113113
B97F7DEA5023F3__no
2017-11-13T22:51:31kkmrkkblmbrbkc4.xlarge
190035050462974566113113
B97F7DEA5023F3__no


P-1 factor-bounds graph:
B1 = 580000, B2 = 15080000 (P-1 stage 2)
B1 = 580000 (P-1 stage 1)
B1 = 201854 (P-1 stage 1)
B1 = 30000, B2 = 547500 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 3000 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
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102
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109
TF factor-bounds graph:
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265
264
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261
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2100
Last modified: 2022-09-23T14:57:44+00:00