is 2 2926487 - 1
has 880961 decimal digits
takes 0.226 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6E7A0E5ED594C66Adouble-checked
PRPD33FE977143C455Dverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26940.795368.1159%1000000200000000.22795.0509%41.023269.7264%1.6104%
PrimeNet2590.026262.7119%130002600000.00303.0693%0.029263.8563%1.1445%
GPU722630.545465.0794%170003000000.00361.9447%0.549065.7585%0.6791%
Difference+6+40.2499+3.0366%+983000+19700000+0.2243+3.1062%+40.4742+3.9679%+3.9679%

Known prime factors (1 factor, 84.2 bits, 0.00287548% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2926487214686005414517221641444392684.1503667981532371700637
3 × 15580393 × 78474304903
2021-06-0215580393784743049031,633,463480.47894.31

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-13T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.198%
2003-12-23T00:00:00Team Prime Ribv4_computers1000010000---0.001--0.120%
2010-11-12T15:15:00markrtiny1050002283750---0.025--2.294%
2015-04-27T09:55:00VictordeHollanderManual testing100000020000000---0.228--5.051%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:24Mark RoseManual testing21260--0.052--
2009-02-14T16:37:00Sturle Sundehaydn.ifi260261--0.052--
2012-01-07T16:29:00markroldgamer261262--0.105--
2013-01-07T13:49:00dbaughManual testing262263--0.335--
2015-04-25T17:16:00VictordeHollanderManual testing263264--0.671--
2015-04-25T17:16:00VictordeHollanderManual testing264265--1.277--
2016-02-23T09:49:03ramgeisManual testing265266--2.553--
2017-11-22T00:30:13Gordon SpenceManual testing266267--5.107--
2018-12-20T02:16:12chuenkitManual testing267268--10.21--
2021-05-31T09:33:00TJAOIManual testing268269--20.43--


ECM factoring results:

Old Calculation Method

Total ECM effort:7.871 GHz-days
Estimated T-Level:3.750
DigitsB1CurvesCompleteFacMiss
201100075 / 1000.75047.059%
255000075 / 2800.26876.465%

New Calculation Method

Total ECM effort:7.871 GHz-days
Estimated T-Level:3.750
DigitsB1CompleteFacMiss
20110002.4198.898%
25500000.21980.360%
302500000.01398.663%


ECM Summary

B1B2factorcurvesGHz-days
500005000000747.766
50000500000010.105


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02T00:00:00ANONYMOUSv4_computers6E7A0E5ED594C66A0.226
2018-10-06T10:46:52kkmrkkblmbrbkold6E7A0E5ED594C66A0.226


PRP results:
dateuseridcompidcofactorsres64PRP
2021-06-04T06:59:44kutensterra
21468600541451722164144439
D33FE977143C455Dno


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: 2021-06-04T06:59:44+00:00