is 2 2280463 - 1
has 686488 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-L86F91F057E3D2F15double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26826.137267.6471%51902251902200.07373.8071%26.210968.8788%1.2317%
PrimeNet2580.016862.0690%100001900000.00192.9234%0.018763.1778%1.1089%
GPU722620.269464.5161%120002000000.00211.7346%0.271565.1316%0.6155%
Difference+6+25.8678+3.1309%+507022+4990220+0.0716+2.0725%+25.9394+3.7471%+3.7471%

Known prime factors (1 factor, 88.7 bits, 0.00388791% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
22804634897775542197081088327332072788.662107385551578716275781
32 × 7 × 17 × 751 × 3776239 × 35355499
2020-05-1837762393535549947,604,6110.52400.7327

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%
2010-11-24T11:45:00Oscar Östlin7501175011---0.007--0.678%
2011-01-15T00:32:00Oscar Östlin850001742500---0.017--2.233%
2014-06-11T02:09:00Jocelyn LaroucheManual testing113145113145---0.011--0.869%
2014-10-06T21:12:00Jocelyn LaroucheManual testing141290141290---0.013--0.986%
2016-01-23T12:46:39Jocelyn LaroucheManual testing51902251902206---0.074--3.807%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:11Mark RoseManual testing21260--0.067--
2009-01-15T05:38:00Sturle Sundegowin.ifi260261--0.067--
2012-05-09T17:48:00Sebastian HornbostelManual testing261262--0.135--
2013-01-23T08:24:00dbaughManual testing262263--0.430--
2015-03-12T10:50:00VictordeHollanderManual testing263264--0.861--
2015-03-12T10:50:00VictordeHollanderManual testing264265--1.638--
2015-11-01T21:51:01ramgeisManual testing265266--3.277--
2017-02-13T09:31:36Smok_bmvManual testing266267--6.554--
2019-09-09T13:15:03YxinityManual testing267268--13.11--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.505 GHz-days
Estimated T-Level:3.200
DigitsB1CurvesCompleteFacMiss
201100064 / 1000.64052.560%
255000064 / 2800.22979.534%

New Calculation Method

Total ECM effort:5.505 GHz-days
Estimated T-Level:3.200
DigitsB1CompleteFacMiss
20110002.06512.688%
25500000.18782.978%
302500000.01198.858%


ECM Summary

B1B2factorcurvesGHz-days
500005000000635.419
50000500000010.086


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-09T00:00:00ANONYMOUSv4_computers86F91F057E3D2F150.150
2018-04-27T14:47:28kkmrkkblmbrbkold86F91F057E3D2F150.150


PRP results:
dateuseridcompidcofactorsres64PRP
2020-05-19T13:26:23mnd975203
489777554219708108832733207
3EAB8DD4809D987Cno
2020-05-20T05:20:03Luigi Morelli9800X
489777554219708108832733207
3EAB8DD4809D987Cno


P-1 factor-bounds graph:
B1 = 519022, B2 = 5190220 (P-1 stage 2)
B1 = 519022 (P-1 stage 1)
B1 = 85000, B2 = 1742500 (P-1 stage 2)
B1 = 141290 (P-1 stage 1)
B1 = 113145 (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
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2020-05-20T05:20:03+00:00