is 2 2605741 - 1
has 784407 decimal digits
takes 0.181 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9D871527A8643DE4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26822.874467.6471%3000000900000000.77847.7809%23.652970.1644%2.5173%
PrimeNet2590.029562.7119%110002000000.00212.6960%0.031663.7171%1.0053%
GPU722630.612565.0794%120002000000.00221.5310%0.614765.6140%0.5346%
Difference+5+22.2619+2.5677%+2988000+89800000+0.7762+6.2499%+23.0381+4.5504%+4.5504%

Known prime factors (1 factor, 80.5 bits, 0.00309048% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
260574117454872199449869334477832580.530334931065663277151
32 × 11775461 × 3160348699
2020-07-30117754613160348699187,76118.43732.344

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.238%
2003-11-08T00:00:00Team Prime Ribv4_computers15000217500---0.003--0.781%
2010-11-16T23:09:00Jocelyn LaroucheManual testing2000020000---0.002--0.266%
2010-12-16T03:52:00markrtiny1000002125000---0.021--2.472%
2014-10-10T20:28:00Jocelyn LaroucheManual testing124632124632---0.013--0.941%
2016-05-18T03:31:28Jocelyn LaroucheManual testing20000036000006---0.039--3.154%
2017-07-10T01:11:33Jocelyn Larouchelow 4M40000040000006---0.060--3.544%
2019-12-03T14:18:33masserManual testing20000005000000012---0.464--6.846%
2019-12-04T00:03:52BigBrotherWinston30000009000000012---0.778--7.781%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.029--
2016-02-23T16:29:17Mark RoseManual testing259260--0.029--
2009-01-27T16:57:00Sturle Sundegolan.ifi260261--0.059--
2012-06-24T10:42:00Sebastian HornbostelManual testing261262--0.118--
2013-01-14T11:55:00dbaughManual testing262263--0.377--
2015-02-18T11:41:00VictordeHollanderManual testing263264--0.753--
2015-02-18T11:41:00VictordeHollanderManual testing264265--1.434--
2016-01-15T14:57:03ramgeisManual testing265266--2.868--
2017-08-24T10:53:49Gordon SpenceManual testing266267--5.736--
2019-05-13T13:38:11TJAOIManual testing267268--11.47--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.255 GHz-days
Estimated T-Level:2.300
DigitsB1CurvesCompleteFacMiss
201100046 / 1000.46062.982%
255000046 / 2800.16484.825%

New Calculation Method

Total ECM effort:4.255 GHz-days
Estimated T-Level:2.300
DigitsB1CompleteFacMiss
20110001.76917.046%
25500000.16484.900%
302500000.01098.973%


ECM Summary

B1B2factorcurvesGHz-days
500005000000454.163
50000500000010.093


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers9D871527A8643DE40.181
2018-06-27T22:02:15kkmrkkblmbrbkold9D871527A8643DE40.181


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-30T20:42:33CrypticClueManual testing
1745487219944986933447783
0CB989606A4A59C1no
2020-07-31T20:26:04marssystemssystem03
1745487219944986933447783
0CB989606A4A59C1no


P-1 factor-bounds graph:
B1 = 3000000, B2 = 90000000 (P-1 stage 2)
B1 = 2000000, B2 = 50000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 400000, B2 = 4000000 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
B1 = 200000, B2 = 3600000 (P-1 stage 2)
B1 = 100000, B2 = 2125000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 124632 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (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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1010
TF factor-bounds graph:
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Last modified: 2020-07-31T20:26:04+00:00