is 2 2466263 - 1
has 742420 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-LDED10471C2DBFF25double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.168167.6471%60000001800000001.55699.0161%25.725070.5640%2.9170%
PrimeNet2590.031162.7119%100001800000.00192.5314%0.033163.6558%0.9439%
GPU722630.647165.0794%100001600000.00181.3352%0.649065.5456%0.4662%
Difference+5+23.5210+2.5677%+5990000+179840000+1.5551+7.6809%+25.0760+5.0184%+5.0184%

Known prime factors (1 factor, 79.2 bits, 0.00321020% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24662636809569093654537219745932479.172138054398368189792
25 × 4314199949005931
2020-07-0732431419994900593154,07023,639,77844,152,523

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 testing246626246626---0.025--1.338%
2013-10-22T12:54:00David Campeaui5-2500k59000015930000---0.143--4.921%
2019-03-31T01:22:13Sid & 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--
2009-02-13T00:34:00Sturle Sundefigaro.ifi260261--0.062--
2012-06-08T09:43:00Sebastian HornbostelManual testing261262--0.125--
2013-01-23T08:28:00dbaughManual 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--6.060--
2019-06-17T12:14:55TJAOIManual testing267268--12.12--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.863 GHz-days
Estimated T-Level:2.650
DigitsB1CurvesCompleteFacMiss
201100053 / 1000.53058.704%
255000053 / 2800.18982.727%

New Calculation Method

Total ECM effort:4.863 GHz-days
Estimated T-Level:2.650
DigitsB1CompleteFacMiss
20110001.71018.092%
25500000.15585.683%
302500000.01099.053%


ECM Summary

B1B2factorcurvesGHz-days
500005000000514.679
50000500000020.184


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computersDED10471C2DBFF250.171
2018-05-28T03:32:21kkmrkkblmbrbkoldDED10471C2DBFF250.171


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-08T09:45:12pew10980xe_1
680956909365453721974593
161FF02CBE4F9FB7no
2020-07-10T06:55:42daveward2005Davy
680956909365453721974593
161FF02CBE4F9FB7no


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 = 246626 (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: 2020-07-10T06:55:42+00:00