is 2 2482993 - 1
has 747456 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-L2E82CBE335A53778double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.005367.6471%2382500857701000.69657.5487%24.701870.0893%2.4422%
PrimeNet2590.030962.7119%100001800000.00192.5346%0.032963.6570%0.9451%
GPU722630.642865.0794%110001600000.00191.3802%0.644765.5613%0.4820%
Difference+5+23.3625+2.5677%+2371500+85610100+0.6946+6.1686%+24.0571+4.5280%+4.5280%

Known prime factors (1 factor, 82.9 bits, 0.00333858% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
248299390028346190360290464976712582.8971812899718008876595
3 × 5 × 7 × 71 × 971 × 250441850279
2020-07-31971250441850279672,3921,372.32,563.1

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_computers15000228750---0.003--0.786%
2010-11-20T12:25:00Jocelyn LaroucheManual testing2000020000---0.002--0.263%
2011-01-21T10:12:00Oscar Östlin950001947500---0.020--2.378%
2014-09-02T00:10:00Jocelyn LaroucheManual testing120850120850---0.012--0.917%
2014-11-07T00:21:00mikrMSI238250085770100---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--
2009-01-14T20:46:00Sturle Sundeghini.ifi260261--0.062--
2012-06-09T08:42:00Sebastian HornbostelManual testing261262--0.124--
2013-08-21T05:37:00David CampeauManual testing262263--0.395--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.791--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.505--
2015-10-29T11:36:22ramgeisManual testing265266--3.010--
2017-07-22T20:28:37Gordon SpenceManual testing266267--6.019--
2019-07-01T11:11:00TJAOIManual testing267268--12.04--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.694 GHz-days
Estimated T-Level:3.100
DigitsB1CurvesCompleteFacMiss
201100062 / 1000.62053.627%
255000062 / 2800.22180.106%

New Calculation Method

Total ECM effort:5.694 GHz-days
Estimated T-Level:3.100
DigitsB1CompleteFacMiss
20110002.00013.534%
25500000.18183.464%
302500000.01198.893%


ECM Summary

B1B2factorcurvesGHz-days
500005000000605.511
50000500000020.184


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-07T00:00:00ANONYMOUSv4_computers2E82CBE335A537780.172
2018-05-30T18:31:32kkmrkkblmbrbkold2E82CBE335A537780.172


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-02T09:22:19ANONYMOUSdory
9002834619036029046497671
39A694657C619C__no
2020-11-11T15:45:44Oliver KruseIOS-5
9002834619036029046497671
39A694657C619C30no


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 = 120850 (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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266
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Last modified: 2020-11-11T15:45:44+00:00