is 2 2576089 - 1
has 775481 decimal digits
takes 0.179 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC2547376F73E7E5Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.534567.1642%32000001120000000.91808.7524%12.452570.0381%2.8739%
PrimeNet2590.029862.7119%110002000000.00212.6903%0.032063.7150%1.0032%
GPU722630.619665.0794%120001900000.00221.5048%0.621765.6049%0.5255%
Difference+4+10.9150+2.0848%+3188000+111810000+0.9158+7.2476%+11.8308+4.4332%+4.4332%

Known prime factors (1 factor, 93.3 bits, 0.00362049% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2576089119170074612047247678514567192993.2672313003832787750106431
7 × 17 × 41 × 107 × 109 × 625517 × 64982459
2016-07-02625517649824591.266e+90.41560.6650

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.293%
2003-11-08T00:00:00Team Prime Ribv4_computers15000202500---0.003--0.891%
2010-12-21T11:04:00Jocelyn LaroucheManual testing2000020000---0.002--0.316%
2011-01-11T22:55:00Jocelyn LaroucheManual testing5000050000---0.005--0.621%
2011-10-07T22:12:00markrtiny1750004112500---0.039--3.542%
2016-07-02T19:44:57mikrMSI3200000112000000122993.2670.9180.3571.8368.752%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.030--
2016-02-23T16:29:16Mark RoseManual testing259260--0.030--
2009-02-01T10:12:00Sturle Sundehaydn.ifi260261--0.060--
2012-06-19T12:42:00Sebastian HornbostelManual testing261262--0.119--
2013-01-14T11:55:00dbaughManual testing262263--0.381--
2015-02-27T20:35:00VictordeHollanderManual testing263264--0.762--
2015-02-27T20:35:00VictordeHollanderManual testing264265--1.450--
2015-11-08T21:03:05ramgeisManual testing265266--2.901--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.662 GHz-days
Estimated T-Level:0.900
DigitsB1CurvesCompleteFacMiss
201100018 / 1000.18083.451%
255000018 / 2800.06493.763%

New Calculation Method

Total ECM effort:1.662 GHz-days
Estimated T-Level:0.900
DigitsB1CompleteFacMiss
20110000.58155.954%
25500000.05294.888%
302500000.00399.677%


ECM Summary

B1B2factorcurvesGHz-days
500005000000181.662


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00ANONYMOUSv4_computersC2547376F73E7E5D0.179


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-15T07:57:43Oliver KruseGTX-2
11917007461204724767851456719
9465AA955D51A6__no
2017-12-02T00:13:31kkmrkkblmbrbkc4.xlarge
11917007461204724767851456719
9465AA955D51A6__no


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 175000, B2 = 4112500 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 15000, B2 = 202500 (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
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107
102
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109
TF factor-bounds graph:
267
266
265
264
263
262
261
260
259
250
260
270
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290
2100
Last modified: 2017-12-02T00:13:31+00:00