is 2 2947897 - 1
has 887406 decimal digits
takes 0.251 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L34A842F9BD74C2B3double-checked
PRPB2C3CED6AD594F44verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26820.219567.6471%1000000200000000.25125.5433%20.470669.4405%1.7934%
PrimeNet2590.026162.7119%130002600000.00333.0732%0.029363.8578%1.1460%
GPU722630.541465.0794%170003000000.00401.9473%0.545465.7594%0.6800%
Difference+5+19.6780+2.5677%+983000+19700000+0.2472+3.5959%+19.9252+3.6811%+3.6811%

Known prime factors (1 factor, 72.3 bits, 0.00245310% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
294789758741383997635167391132272.315996326940826548
22 × 32 × 17 × 29 × 56137420601
2020-10-202956137420601353.07377.46704.98

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-13T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.246%
2010-11-04T05:42:00markrtiny950001971250---0.024--2.449%
2014-11-06T23:05:00Jocelyn LaroucheManual testing116773116773---0.014--0.928%
2015-04-30T21:53:00VictordeHollanderManual testing100000020000000---0.251--5.543%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:25Mark RoseManual testing21260--0.052--
2009-02-13T21:01:00Sturle Sundebach.ifi260261--0.052--
2011-12-14T05:25:00Sebastian HornbostelManual testing261262--0.104--
2013-01-10T21:10:00dbaughManual testing262263--0.333--
2015-04-27T09:54:00VictordeHollanderManual testing263264--0.666--
2015-04-27T09:54:00VictordeHollanderManual testing264265--1.267--
2016-02-25T09:22:06ramgeisManual testing265266--2.535--
2017-11-28T10:01:36Gordon SpenceManual testing266267--5.070--
2018-12-24T00:53:32chuenkitManual testing267268--10.14--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.126 GHz-days
Estimated T-Level:1.350
DigitsB1CurvesCompleteFacMiss
201100027 / 1000.27076.234%
255000027 / 2800.09690.792%

New Calculation Method

Total ECM effort:3.126 GHz-days
Estimated T-Level:1.350
DigitsB1CompleteFacMiss
20110000.87141.855%
25500000.07992.430%
302500000.00599.516%


ECM Summary

B1B2factorcurvesGHz-days
500005000000252.895
50000500000020.232


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-09T00:00:00ANONYMOUSv4_computers34A842F9BD74C2B30.251
2018-10-12T03:56:25kkmrkkblmbrbkold34A842F9BD74C2B30.251


PRP results:
dateuseridcompidcofactorsres64PRP
2020-10-21T16:44:08tottenhoff3-of-4-Ryzen-5-3600
5874138399763516739113
B2C3CED6AD594F44no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 95000, B2 = 1971250 (P-1 stage 2)
B1 = 116773 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-10-21T16:44:08+00:00