is 2 2455477 - 1
has 739173 decimal digits
takes 0.170 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3993760391F688EBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.274367.6471%2382500857701000.69657.5402%24.970870.0865%2.4395%
PrimeNet2590.031362.7119%100001800000.00192.5293%0.033263.6550%0.9431%
GPU722630.650065.0794%100001600000.00181.3340%0.651865.5452%0.4658%
Difference+5+23.6243+2.5677%+2372500+85610100+0.6947+6.2062%+24.3190+4.5413%+4.5413%

Known prime factors (1 factor, 68.7 bits, 0.00279940% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24554774924666384957830896232168.739100279220390943
3 × 11 × 3038764254271
2020-06-1311303876425427126.18716,65131,099

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.234%
2003-10-31T00:00:00Team Prime Ribv4_computers15000232500---0.003--0.788%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.262%
2011-01-19T15:46:00Oscar Östlin950001947500---0.020--2.374%
2014-05-17T18:37:00mikrMSI238250085770100---0.697--7.540%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-08-07T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:14Mark RoseManual testing259260--0.031--
2009-01-14T00:45:00Sturle Sundeginy.ifi260261--0.063--
2012-06-07T13:43:00Sebastian HornbostelManual testing261262--0.125--
2013-12-04T21:13:00Jerry HallettManual testing262263--0.400--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.800--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.522--
2015-10-25T20:35:06ramgeisManual testing265266--3.043--
2017-07-14T10:08:13Gordon SpenceManual testing266267--6.087--
2019-07-17T09:51:51TJAOIManual testing267268--12.17--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.310 GHz-days
Estimated T-Level:2.350
DigitsB1CurvesCompleteFacMiss
201100047 / 1000.47062.353%
255000047 / 2800.16884.522%

New Calculation Method

Total ECM effort:4.310 GHz-days
Estimated T-Level:2.350
DigitsB1CompleteFacMiss
20110001.51621.956%
25500000.13787.195%
302500000.00899.160%


ECM Summary

B1B2factorcurvesGHz-days
500005000000454.126
50000500000020.183


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-11-14T22:44:59MadPooManual testing3993760391F688EB0.170


PRP results:
dateuseridcompidcofactorsres64PRP
2020-06-14T19:20:00oodairacom1
492466638495783089623
229EE5F78BF66019no
2020-06-16T01:38:23Team_InspectorSpudBoy4
492466638495783089623
229EE5F78BF66019no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 232500 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (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: 2020-06-16T01:38:23+00:00