is 2 2887711 - 1
has 869288 decimal digits
takes 0.223 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L34C871D23A505899double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26820.640967.6471%59719659719600.09974.1067%20.740568.9757%1.3286%
PrimeNet2590.026662.7119%130002400000.00282.9999%0.029463.8305%1.1186%
GPU722630.552765.0794%160003000000.00351.9075%0.556265.7455%0.6661%
Difference+5+20.0882+2.5677%+581196+5671960+0.0962+2.1992%+20.1843+3.2302%+3.2302%

Known prime factors (1 factor, 80.7 bits, 0.00279485% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
288771119736425631476911423243132580.707341731316455782996
22 × 3 × 19 × 2702057 × 554696501
2019-06-212702057554696501139,4183.67076.3214

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-02T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.245%
2016-10-07T05:48:04Jocelyn Larouchelow 4M12000036000006---0.035--2.930%
2016-10-07T05:48:05Jocelyn Larouchelow 4M1200004320000---0.039--3.047%
2016-12-16T17:35:05Jocelyn Larouchelow 4M172800172800---0.019--1.146%
2016-12-24T02:28:29Jocelyn Larouchelow 4M207360207360---0.023--1.259%
2017-02-25T21:08:04Jocelyn Larouchelow 4M29859829859806---0.050--3.237%
2017-10-13T14:03:46Jocelyn Larouchelow 4M59719659719606---0.100--4.107%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:24Mark RoseManual testing21260--0.053--
2009-02-12T23:51:00Sturle Sundekorsmo.ifi260261--0.053--
2012-01-20T20:16:00Grant McCrackenhome261262--0.106--
2013-01-10T10:24:00dbaughManual testing262263--0.340--
2015-04-21T09:21:00VictordeHollanderManual testing263264--0.680--
2015-04-21T09:21:00VictordeHollanderManual testing264265--1.294--
2015-11-27T14:25:32omylistManual testing265266--2.588--
2017-11-13T23:00:10Gordon SpenceManual testing266267--5.176--
2019-01-11T03:01:55chuenkitManual testing267268--10.35--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.675 GHz-days
Estimated T-Level:0.800
DigitsB1CurvesCompleteFacMiss
201100016 / 1000.16085.146%
255000016 / 2800.05794.436%

New Calculation Method

Total ECM effort:1.675 GHz-days
Estimated T-Level:0.800
DigitsB1CompleteFacMiss
20110000.61554.043%
25500000.05794.465%
302500000.00499.641%


ECM Summary

B1B2factorcurvesGHz-days
500005000000151.571
50000500000010.105


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-01-21T00:00:00ANONYMOUSv4_computers34C871D23A5058990.223
1999-06-06T00:00:00ANONYMOUSv4_computers34C871D23A5058990.223
1999-07-27T00:00:00ANONYMOUSv4_computers34C871D23A5058990.223
2018-09-26T23:23:11kkmrkkblmbrbkold34C871D23A5058990.223


PRP results:
dateuseridcompidcofactorsres64PRP
2019-06-21T18:22:32Niels_Mache_NextcloudSuperDry-X
1973642563147691142324313
D02AC63DB0F92393no
2019-06-22T15:32:13kkmrkkblmbrbkc5.large
1973642563147691142324313
D02AC63DB0F92393no


P-1 factor-bounds graph:
B1 = 597196, B2 = 5971960 (P-1 stage 2)
B1 = 597196 (P-1 stage 1)
B1 = 298598, B2 = 2985980 (P-1 stage 2)
B1 = 120000, B2 = 4320000 (P-1 stage 2)
B1 = 120000, B2 = 3600000 (P-1 stage 2)
B1 = 298598 (P-1 stage 1)
B1 = 207360 (P-1 stage 1)
B1 = 172800 (P-1 stage 1)
B1 = 120000 (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
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2019-06-22T15:32:13+00:00