is 2 2485183 - 1
has 748115 decimal digits
takes 0.172 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L525C3CB5E013F98Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.984167.6471%2382500857701000.69657.5494%24.680670.0895%2.4425%
PrimeNet2590.030962.7119%100001800000.00192.5350%0.032863.6571%0.9453%
GPU722630.642265.0794%110001600000.00191.3804%0.644165.5614%0.4820%
Difference+5+23.3419+2.5677%+2371500+85610100+0.6946+6.1690%+24.0365+4.5281%+4.5281%

Known prime factors (1 factor, 69.1 bits, 0.00277888% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24851836154344066128873323432169.060123820742096837
293 × 422596389409
2020-07-2429342259638940990.7042,315.64,324.9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_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%
2011-01-22T02:53:00Oscar Östlin950001947500---0.020--2.379%
2014-09-03T20:52:00Jocelyn LaroucheManual testing120827120827---0.012--0.917%
2014-11-12T00:46:00mikrMSI238250085770100---0.697--7.549%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-14T20:18:00Sturle Sundegobi.ifi260261--0.062--
2012-06-10T10:42:00Sebastian HornbostelManual testing261262--0.124--
2013-01-14T11:53:00dbaughManual testing262263--0.395--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.790--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.503--
2015-10-30T09:42:34ramgeisManual testing265266--3.007--
2017-07-22T20:28:38Gordon SpenceManual testing266267--6.014--
2019-06-17T12:14:55TJAOIManual testing267268--12.03--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.511 GHz-days
Estimated T-Level:3.000
DigitsB1CurvesCompleteFacMiss
201100060 / 1000.60054.716%
255000060 / 2800.21480.681%

New Calculation Method

Total ECM effort:5.511 GHz-days
Estimated T-Level:3.000
DigitsB1CompleteFacMiss
20110001.93514.435%
25500000.17583.952%
302500000.01198.929%


ECM Summary

B1B2factorcurvesGHz-days
500005000000575.236
50000500000030.276


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-06-06T00:00:00ANONYMOUSv4_computers525C3CB5E013F98C0.172
2018-05-31T01:37:31kkmrkkblmbrbkold525C3CB5E013F98C0.172


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-25T14:10:37argusdustyArgus-PC
615434406612887332343
6685805861540181no
2020-07-26T09:23:22marssystemssystem03
615434406612887332343
6685805861540181no


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 = 120827 (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: 2020-07-26T09:23:22+00:00