is 2 2494673 - 1
has 750972 decimal digits
takes 0.173 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3D70B245B9D51800double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.892967.6471%2382500857701000.69657.5523%24.589470.0905%2.4434%
PrimeNet2590.030862.7119%100001800000.00192.5369%0.032763.6578%0.9459%
GPU722630.639865.0794%110001600000.00191.3815%0.641765.5618%0.4824%
Difference+5+23.2531+2.5677%+2371500+85610100+0.6946+6.1708%+23.9477+4.5287%+4.5287%

Known prime factors (1 factor, 72.3 bits, 0.00289818% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
249467358140684548000186724012272.3001165296705179400
23 × 32 × 52 × 647387058433
2020-08-2925647387058433692.083,547.46,625.5

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.235%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.786%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.263%
2011-01-24T23:16:00Oscar Östlin950001971250---0.020--2.387%
2014-09-10T00:51:00Jocelyn LaroucheManual testing120729120729---0.012--0.917%
2014-12-06T01:33:00mikrMSI238250085770100---0.697--7.552%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-08-16T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-11T02:42:00Sturle Sundeginglo.ifi260261--0.062--
2012-06-11T12:42:00Sebastian HornbostelManual testing261262--0.123--
2013-12-04T21:13:00Jerry HallettManual testing262263--0.394--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.787--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.498--
2015-10-31T16:44:06ramgeisManual testing265266--2.995--
2017-07-24T22:21:29Gordon SpenceManual testing266267--5.991--
2019-04-01T13:34:43TJAOIManual testing267268--11.98--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.709 GHz-days
Estimated T-Level:3.650
DigitsB1CurvesCompleteFacMiss
201100073 / 1000.73048.014%
255000073 / 2800.26177.014%

New Calculation Method

Total ECM effort:6.709 GHz-days
Estimated T-Level:3.650
DigitsB1CompleteFacMiss
20110002.3559.491%
25500000.21380.830%
302500000.01398.698%


ECM Summary

B1B2factorcurvesGHz-days
500005000000666.066
50000500000070.643


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-12T00:00:00ANONYMOUSv4_computers3D70B245B9D518000.173
2018-06-01T10:51:50kkmrkkblmbrbkold3D70B245B9D518000.173


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-30T07:23:42mnd9printer
5814068454800018672401
FD754362F9B77EBFno
2020-08-31T09:51:34kutenshadar
5814068454800018672401
FD754362F9B77EBFno


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1971250 (P-1 stage 2)
B1 = 120729 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (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: 2020-08-31T09:51:34+00:00