is 2 2245979 - 1
has 676108 decimal digits
takes 0.148 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDCF3FFDDF595E268double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26826.538567.6471%1000000100000000.14214.6759%26.680669.1598%1.5128%
PrimeNet2580.017162.0690%100001800000.00182.8740%0.018963.1591%1.0901%
GPU722620.273564.5161%110001900000.00201.6594%0.275565.1049%0.5888%
Difference+6+26.2649+3.1309%+989000+9810000+0.1401+3.0165%+26.4051+4.0549%+4.0549%

Known prime factors (1 factor, 68.5 bits, 0.00304961% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
22459794155304109515230709912168.49492505408766405
5 × 2754893 × 6715717
2020-04-302754893671571734.6330.28320.5345

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-18T00:04:00Jocelyn LaroucheManual testing5000050000---0.005--0.517%
2012-01-07T14:05:00Squeeky_SquirrelP4_26001500003262500---0.030--2.880%
2015-12-05T07:06:24Alexander DubrovinManual testing10000001000000012---0.142--4.676%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:09Mark RoseManual testing21260--0.068--
2009-01-11T10:30:00Sturle Sundegibsy.ifi260261--0.068--
2012-05-03T17:47:00Sebastian HornbostelManual testing261262--0.137--
2013-12-04T02:15:00LaurVManual testing262263--0.437--
2015-03-10T10:44:00VictordeHollanderManual testing263264--0.874--
2015-03-10T10:44:00VictordeHollanderManual testing264265--1.664--
2015-10-27T09:37:29ramgeisManual testing265266--3.327--
2017-01-05T21:20:48Gordon SpenceManual testing266267--6.654--
2019-04-01T13:34:46TJAOIManual testing267268--13.31--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.580 GHz-days
Estimated T-Level:3.250
DigitsB1CurvesCompleteFacMiss
201100065 / 1000.65052.034%
255000065 / 2800.23279.250%

New Calculation Method

Total ECM effort:5.580 GHz-days
Estimated T-Level:3.250
DigitsB1CompleteFacMiss
20110002.09712.285%
25500000.19082.737%
302500000.01298.840%


ECM Summary

B1B2factorcurvesGHz-days
500005000000635.408
50000500000020.172


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-06-09T00:00:00ANONYMOUSv4_computersDCF3FFDDF595E2680.148
2002-06-23T00:00:00ANONYMOUSv4_computersDCF3FFDDF595E2680.148
2016-05-07T00:21:10kkmrkkblmbrbkoldDCF3FFDDF595E2680.148


PRP results:
dateuseridcompidcofactorsres64PRP
2020-04-30T13:46:31CrypticCluecruncher
415530410951523070991
A4B269239DF46768no
2020-05-01T16:07:16marssystemsSYSTEM01
415530410951523070991
A4B269239DF46768no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 10000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 150000, B2 = 3262500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2020-05-01T16:07:16+00:00