is 2 2280071 - 1
has 686370 decimal digits
takes 0.150 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF858AD31BB01278Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26826.141767.6471%51906251906200.07383.8071%26.215468.8788%1.2317%
PrimeNet2580.016862.0690%100001900000.00192.9233%0.018763.1778%1.1088%
GPU722620.269464.5161%120001900000.00211.7092%0.271565.1226%0.6065%
Difference+6+25.8722+3.1309%+507062+5000620+0.0717+2.0979%+25.9439+3.7562%+3.7562%

Known prime factors (1 factor, 76.5 bits, 0.00335370% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
22800711044256921256472220429192476.46722899657976801429
2271307 × 10082150047
2020-07-0922713071008215004710,70652.57497.811

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-04-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.229%
2010-11-07T01:16:00Jocelyn LaroucheManual testing1500015000---0.001--0.200%
2010-11-14T20:17:00Jocelyn LaroucheManual testing2000020000---0.002--0.258%
2010-11-24T12:47:00Oscar Östlin7501175011---0.007--0.678%
2011-01-14T14:34:00Oscar Östlin850001742500---0.017--2.233%
2014-06-11T02:09:00Jocelyn LaroucheManual testing113150113150---0.011--0.869%
2014-10-06T21:12:00Jocelyn LaroucheManual testing141300141300---0.013--0.986%
2016-01-23T12:46:39Jocelyn LaroucheManual testing51906251906206---0.074--3.807%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:11Mark RoseManual testing21260--0.067--
2009-01-15T01:45:00Sturle Sundegowin.ifi260261--0.067--
2012-05-09T17:47:00Sebastian HornbostelManual testing261262--0.135--
2013-01-23T08:24:00dbaughManual testing262263--0.431--
2015-03-12T10:50:00VictordeHollanderManual testing263264--0.861--
2015-03-12T10:50:00VictordeHollanderManual testing264265--1.639--
2015-11-01T21:51:01ramgeisManual testing265266--3.277--
2017-02-13T09:31:36Smok_bmvManual testing266267--6.555--
2019-09-09T13:15:03YxinityManual testing267268--13.11--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.710 GHz-days
Estimated T-Level:3.900
DigitsB1CurvesCompleteFacMiss
201100078 / 1000.78045.661%
255000078 / 2800.27975.649%

New Calculation Method

Total ECM effort:6.710 GHz-days
Estimated T-Level:3.900
DigitsB1CompleteFacMiss
20110002.5168.077%
25500000.22779.660%
302500000.01498.609%


ECM Summary

B1B2factorcurvesGHz-days
500005000000756.452
50000500000030.258


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-09T00:00:00ANONYMOUSv4_computersF858AD31BB01278D0.150
2018-04-27T09:21:06kkmrkkblmbrbkoldF858AD31BB01278D0.150


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-09T05:38:48CrypticCluecruncher
104425692125647222042919
E064DA828F1DF59Ano
2020-07-09T20:11:53pew10980xe_1
104425692125647222042919
E064DA828F1DF59Ano


P-1 factor-bounds graph:
B1 = 519062, B2 = 5190620 (P-1 stage 2)
B1 = 519062 (P-1 stage 1)
B1 = 85000, B2 = 1742500 (P-1 stage 2)
B1 = 141300 (P-1 stage 1)
B1 = 113150 (P-1 stage 1)
B1 = 85000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
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)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2020-07-09T20:11:53+00:00