is 2 2875489 - 1
has 865609 decimal digits
takes 0.222 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6444A9A1DF580E21double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.333567.1642%12500028125000.03043.1313%10.363968.1924%1.0282%
PrimeNet2590.026762.7119%130002400000.00282.9976%0.029563.8296%1.1177%
GPU722630.555065.0794%160002800000.00341.8702%0.558465.7325%0.6531%
Difference+4+9.7785+2.0848%+109000+2532500+0.0270+1.2610%+9.8055+2.4599%+2.4599%

Known prime factors (1 factor, 65.8 bits, 0.00228776% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2875489635387306384810634312065.78411048334846435
35 × 5 × 9093279709
2015-07-3124390932797094.941955.484103.63

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-28T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.303%
2009-07-03T00:57:00Carsten Kossendeyleela15000161250---0.003--0.847%
2010-12-23T00:29:00Jocelyn LaroucheManual testing2000020000---0.002--0.324%
2011-01-22T22:18:00Jocelyn LaroucheManual testing5000050000---0.006--0.635%
2011-02-07T16:37:00markrtiny1250002812500---0.030--3.131%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-02-12T22:34:00Sturle Sundegopher.ifi260261--0.053--
2012-01-21T11:59:00markroldgamer261262--0.107--
2013-01-07T13:47:00dbaughManual testing262263--0.341--
2015-04-21T09:21:00VictordeHollanderManual testing263264--0.683--
2015-04-21T09:21:00VictordeHollanderManual testing264265--1.299--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.942 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:0.942 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000090.942


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-30T00:00:00ANONYMOUSv4_computers6444A9A1DF580E210.222


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-23T08:30:49Oliver KruseGTX-3
63538730638481063431
0289668BF778B5__no
2017-12-08T01:32:09kkmrkkblmbrbkc4.xlarge
63538730638481063431
0289668BF778B5__no


P-1 factor-bounds graph:
B1 = 125000, B2 = 2812500 (P-1 stage 2)
B1 = 125000 (P-1 stage 1)
B1 = 50000 (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)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2017-12-08T01:32:09+00:00