is 2 2297987 - 1
has 691764 decimal digits
takes 0.155 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9A6DE5C81A5063BDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26825.937967.6471%500000100000000.09974.3690%26.037569.0606%1.4135%
PrimeNet2580.016762.0690%100001900000.00192.9275%0.018663.1794%1.1104%
GPU722620.267364.5161%120002000000.00221.7372%0.269565.1326%0.6164%
Difference+6+25.6705+3.1309%+488000+9800000+0.0975+2.6318%+25.7680+3.9280%+3.9280%

Known prime factors (1 factor, 72.5 bits, 0.00315314% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
229798764897264106966877516172272.4591412045936442784
25 × 607 × 1163 × 62507257
2020-04-25116362507257703.020.33370.6231

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-08-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.229%
2010-11-07T12:40:00Jocelyn LaroucheManual testing1500015000---0.001--0.201%
2010-11-15T02:50:00Jocelyn LaroucheManual testing2000020000---0.002--0.258%
2010-12-04T05:17:00Oscar Östlin7501175011---0.007--0.679%
2011-01-17T21:39:00Oscar Östlin900001755000---0.018--2.267%
2013-11-15T17:52:00c10ck3rManual testing50000010000000---0.100--4.369%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:11Mark RoseManual testing21260--0.067--
2009-01-15T16:09:00Sturle Sundegonsha.ifi260261--0.067--
2012-05-12T07:48:00Sebastian HornbostelManual testing261262--0.134--
2013-01-23T08:24:00dbaughManual testing262263--0.427--
2015-03-12T10:50:00VictordeHollanderManual testing263264--0.854--
2015-03-12T10:50:00VictordeHollanderManual testing264265--1.626--
2015-11-04T09:56:28ramgeisManual testing265266--3.252--
2017-05-27T13:18:47Gordon SpenceManual testing266267--6.504--
2019-03-25T14:11:05TJAOIManual testing267268--13.01--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.043 GHz-days
Estimated T-Level:2.850
DigitsB1CurvesCompleteFacMiss
201100057 / 1000.57056.391%
255000057 / 2800.20481.551%

New Calculation Method

Total ECM effort:5.043 GHz-days
Estimated T-Level:2.850
DigitsB1CompleteFacMiss
20110001.83915.902%
25500000.16684.689%
302500000.01098.982%


ECM Summary

B1B2factorcurvesGHz-days
500005000000544.778
50000500000030.265


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21T00:00:00ANONYMOUSv4_computers9A6DE5C81A5063BD0.155
2018-04-30T05:25:46kkmrkkblmbrbkold9A6DE5C81A5063BD0.155


PRP results:
dateuseridcompidcofactorsres64PRP
2020-04-25T12:16:34CrypticCluecruncher
6489726410696687751617
08B19DAB7C475E5Cno
2020-04-27T19:26:19arnaudstm-11-010
6489726410696687751617
08B19DAB7C475E5Cno


P-1 factor-bounds graph:
B1 = 500000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 90000, B2 = 1755000 (P-1 stage 2)
B1 = 90000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
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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105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2020-04-27T19:26:19+00:00