is 2 2939977 - 1
has 885022 decimal digits
takes 0.250 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC6D9F2970ADC2C72double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26820.273967.6471%1000000200000000.25125.5416%20.525169.4399%1.7929%
PrimeNet2590.026162.7119%130002600000.00333.0718%0.029463.8573%1.1454%
GPU722630.542965.0794%170003000000.00401.9464%0.546965.7591%0.6797%
Difference+5+19.7311+2.5677%+983000+19700000+0.2472+3.5952%+19.9782+3.6809%+3.6809%

Known prime factors (1 factor, 69.0 bits, 0.00234606% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
29399775795615308677730015672168.97498565657293879
98565657293879
2020-10-1119856565729387936.907662,7341,237,802

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-13T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.246%
2003-12-23T00:00:00Team Prime Ribv4_computers1000010000---0.001--0.145%
2010-11-07T02:49:00markrtiny1050002283750---0.028--2.585%
2015-04-29T15:00:00VictordeHollanderManual testing100000020000000---0.251--5.542%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:25Mark RoseManual testing21260--0.052--
2009-02-12T22:37:00Sturle Sundegobi.ifi260261--0.052--
2011-12-28T23:46:00markroldgamer261262--0.104--
2013-01-07T13:49:00dbaughManual testing262263--0.334--
2015-04-25T17:16:00VictordeHollanderManual testing263264--0.668--
2015-04-25T17:16:00VictordeHollanderManual testing264265--1.271--
2016-02-24T09:33:36ramgeisManual testing265266--2.542--
2017-11-24T17:10:14Gordon SpenceManual testing266267--5.084--
2018-12-22T00:20:04chuenkitManual testing267268--10.17--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.241 GHz-days
Estimated T-Level:1.400
DigitsB1CurvesCompleteFacMiss
201100028 / 1000.28075.472%
255000028 / 2800.10090.468%

New Calculation Method

Total ECM effort:3.241 GHz-days
Estimated T-Level:1.400
DigitsB1CompleteFacMiss
20110000.90340.526%
25500000.08292.161%
302500000.00599.499%


ECM Summary

B1B2factorcurvesGHz-days
500005000000252.893
50000500000030.347


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-19T00:00:00ANONYMOUSv4_computersC6D9F2970ADC2C720.250
1999-07-26T00:00:00foxkidv4_computersC6D9F2970ADC2C720.250
2018-10-10T01:04:15kkmrkkblmbrbkoldC6D9F2970ADC2C720.250


PRP results:
dateuseridcompidcofactorsres64PRP
2020-10-14T13:09:43Klaus Nordmannno1
579561530867773001567
E07BCABE7E8D9C__no
2020-11-11T15:45:47Oliver KruseIOS-5
579561530867773001567
E07BCABE7E8D9C53no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 105000, B2 = 2283750 (P-1 stage 2)
B1 = 105000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-11-11T15:45:47+00:00