is 2 2882461 - 1
has 867708 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-L497C057B02FC6EDBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.308567.1642%20000050000000.05173.8254%10.360268.4203%1.2561%
PrimeNet2590.026662.7119%130002400000.00282.9989%0.029563.8301%1.1182%
GPU722630.553765.0794%160002800000.00341.8711%0.557165.7328%0.6534%
Difference+4+9.7548+2.0848%+184000+4720000+0.0483+1.9543%+9.8031+2.6875%+2.6875%

Known prime factors (1 factor, 77.9 bits, 0.00270277% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28824612832276037407372837541992477.90649129477162177959
32 × 71 × 76884940785881
2016-09-13717688494078588114,708469,125876,195

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-28T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.303%
2009-07-03T07:21:00Carsten Kossendeyleela15000161250---0.003--0.848%
2010-12-24T02:50:00Jocelyn LaroucheManual testing2000020000---0.002--0.324%
2011-02-25T05:51:00Carsten Kossendeymother2000005000000---0.052--3.825%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:24Mark RoseManual testing21260--0.053--
2009-02-13T19:23:00Sturle Sundeagrell.ifi260261--0.053--
2012-01-21T12:17:00Grant McCrackenthumper261262--0.107--
2013-01-10T10:24:00dbaughManual testing262263--0.341--
2015-04-21T09:21:00VictordeHollanderManual testing263264--0.681--
2015-04-21T09:21:00VictordeHollanderManual testing264265--1.296--
2015-11-11T02:27:07omylistManual testing265266--2.592--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.361 GHz-days
Estimated T-Level:0.650
DigitsB1CurvesCompleteFacMiss
201100013 / 1000.13087.752%
255000013 / 2800.04695.455%

New Calculation Method

Total ECM effort:1.361 GHz-days
Estimated T-Level:0.650
DigitsB1CompleteFacMiss
20110000.41965.747%
25500000.03896.281%
302500000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.256
50000500000010.105


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computers497C057B02FC6EDB0.223


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-23T11:54:25Oliver KruseGTX-3
283227603740737283754199
25ED8CDD29020D__no
2017-12-08T05:04:17kkmrkkblmbrbkc4.xlarge
283227603740737283754199
25ED8CDD29020D__no


P-1 factor-bounds graph:
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 15000, B2 = 161250 (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)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
TF factor-bounds graph:
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2017-12-08T05:04:17+00:00