is 2 2288687 - 1
has 688964 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-L6D24B13FBA078F34double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.983067.1642%500000150000000.12645.2067%13.109368.8738%1.7097%
PrimeNet2580.016862.0690%100001900000.00192.9253%0.018763.1786%1.1096%
GPU722620.268464.5161%120002000000.00221.7359%0.270665.1321%0.6160%
Difference+5+12.7145+2.6481%+488000+14800000+0.1242+3.4708%+12.8387+3.7418%+3.7418%

Known prime factors (1 factor, 62.3 bits, 0.00272355% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
228868758112856704214805931962.3341269567588408
23 × 3 × 7 × 13697 × 551723
2010-01-05136975517230.40100.00420.0055

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-05-04T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.284%
2016-04-19T11:25:38alpertronManual testing5000001500000012-
skipped known factor: 5811285670421480593
--0.126--5.207%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-01-11T01:51:00Sturle Sundehindemith.ifi260261--0.067--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.265 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.265 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.265


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-23T00:00:00arnaudv4_computers6D24B13FBA078F340.155
1999-09-07T00:00:00ANONYMOUSv4_computers6D24B13FBA078F340.155


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-12T18:06:21kkmrkkblmbrbkc4.xlarge9D1C2FE0203EB2__no
2017-10-30T05:53:35Oliver KruseGTX-3
5811285670421480593
9D1C2FE0203EB2__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (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
TF factor-bounds graph:
267
261
250
260
270
280
290
2100
Last modified: 2017-10-30T05:53:35+00:00