is 2 2894677 - 1
has 871385 decimal digits
takes 0.224 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L60244C6F0EBA85E3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.265067.1642%20000050000000.05173.8275%10.316768.4210%1.2568%
PrimeNet2590.026562.7119%130002400000.00283.0011%0.029463.8309%1.1191%
GPU722630.551465.0794%160003000000.00351.9083%0.554965.7458%0.6664%
Difference+4+9.7137+2.0848%+184000+4700000+0.0482+1.9192%+9.7618+2.6752%+2.6752%

Known prime factors (1 factor, 78.5 bits, 0.00271066% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28946774171483513230723027549592478.46572054386607395627
8719 × 8264065444133
2016-09-158719826406544413328,77950,42494,179

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-02T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.303%
2003-12-13T00:00:00Team Prime Ribv4_computers15000240000---0.003--0.962%
2010-12-24T02:50:00Jocelyn LaroucheManual testing2000020000---0.002--0.325%
2011-02-22T05:44:00Carsten Kossendeymother2000005000000---0.052--3.828%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:24Mark RoseManual testing21260--0.053--
2009-02-14T08:27:00Sturle Sundegehry.ifi260261--0.053--
2012-01-11T18:45:00markroldgamer261262--0.106--
2013-01-07T13:47:00dbaughManual testing262263--0.339--
2015-04-21T09:21:00VictordeHollanderManual testing263264--0.678--
2015-04-21T09:21:00VictordeHollanderManual testing264265--1.291--
2016-02-19T16:47:49ramgeisManual testing265266--2.582--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.571 GHz-days
Estimated T-Level:0.750
DigitsB1CurvesCompleteFacMiss
201100015 / 1000.15086.006%
255000015 / 2800.05494.775%

New Calculation Method

Total ECM effort:1.571 GHz-days
Estimated T-Level:0.750
DigitsB1CompleteFacMiss
20110000.48461.639%
25500000.04495.721%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.257
50000500000030.314


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-22T00:00:00curtiscv4_computers60244C6F0EBA85E30.224


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-24T11:25:24Oliver KruseGTX-1
417148351323072302754959
E3CA7E48AA302D__no
2017-12-08T10:22:45kkmrkkblmbrbkc4.xlarge
417148351323072302754959
E3CA7E48AA302D__no


P-1 factor-bounds graph:
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 15000, B2 = 240000 (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)
102
103
104
105
106
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2017-12-08T10:22:45+00:00