is 2 2466481 - 1
has 742485 decimal digits
takes 0.171 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3786FA37524101F6double-checked
PRP2D38A6AFF3CDDDEEverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.166067.6471%60000001800000001.55699.0161%25.722870.5640%2.9170%
PrimeNet2590.031162.7119%100001800000.00192.5315%0.033163.6558%0.9439%
GPU722630.647165.0794%100001600000.00181.3352%0.648965.5456%0.4663%
Difference+5+23.5189+2.5677%+5990000+179840000+1.5551+7.6809%+25.0739+5.0184%+5.0184%

Known prime factors (1 factor, 78.3 bits, 0.00317549% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24664813780250804662217466855532478.32376632473646912696
23 × 3 × 23 × 53 × 2619376320991
2020-08-2653261937632099143,70814,35326,807

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%
2010-11-19T22:14:00Jocelyn LaroucheManual testing2000020000---0.002--0.263%
2010-11-25T01:29:00Jocelyn LaroucheManual testing246648246648---0.025--1.338%
2013-10-22T14:43:00David Campeaui5-2500k59000015930000---0.143--4.921%
2019-04-19T01:58:48Sid & AndyBullseye600000018000000012---1.557--9.016%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:14Mark RoseManual testing259260--0.031--
2009-02-13T03:35:00Sturle Sundefigaro.ifi260261--0.062--
2012-06-08T10:42:00Sebastian HornbostelManual testing261262--0.125--
2013-01-23T08:29:00dbaughManual testing262263--0.398--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.796--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.515--
2015-10-27T09:37:27ramgeisManual testing265266--3.030--
2017-07-16T22:18:22Gordon SpenceManual testing266267--6.059--
2019-06-17T12:14:55TJAOIManual testing267268--12.12--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.790 GHz-days
Estimated T-Level:3.700
DigitsB1CurvesCompleteFacMiss
201100074 / 1000.74047.534%
255000074 / 2800.26476.739%

New Calculation Method

Total ECM effort:6.790 GHz-days
Estimated T-Level:3.700
DigitsB1CompleteFacMiss
20110002.3879.190%
25500000.21680.594%
302500000.01398.680%


ECM Summary

B1B2factorcurvesGHz-days
500005000000696.331
50000500000050.459


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-23T00:00:00ANONYMOUSv4_computers3786FA37524101F60.171
2018-05-28T05:45:30kkmrkkblmbrbkold3786FA37524101F60.171


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-26T21:01:01jvang3600
378025080466221746685553
2D38A6AFF3CDDDEEno


P-1 factor-bounds graph:
B1 = 6000000, B2 = 180000000 (P-1 stage 2)
B1 = 6000000 (P-1 stage 1)
B1 = 590000, B2 = 15930000 (P-1 stage 2)
B1 = 590000 (P-1 stage 1)
B1 = 246648 (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: 2020-08-26T21:01:01+00:00