is 2 2392573 - 1
has 720237 decimal digits
takes 0.162 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBF63569B9A9E5FFFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.419267.1642%2000000600000000.50557.6128%12.924769.6639%2.4997%
PrimeNet2590.032162.7119%100001700000.00182.4782%0.033963.6359%0.9241%
GPU722630.667165.0794%100001400000.00171.2740%0.668765.5243%0.4449%
Difference+4+11.7522+2.0848%+1990000+59860000+0.5038+6.3388%+12.2559+4.1397%+4.1397%

Known prime factors (1 factor, 61.2 bits, 0.00255978% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
239257327319305757392580971961.245570918959576
23 × 7 × 7883 × 1293287
-788312932870.17660.00760.0129

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-09T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.287%
2003-02-24T00:00:00ANONYMOUSv4_computers4096409600---0.003--0.572%
2003-09-21T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.287%
2018-09-28T16:25:14alpertronManual testing20000006000000012-
skipped known factor: 2731930575739258097
--0.505--7.613%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-09T00:00:00Stephen Woodv4_computers21259--0.032--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.267 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.267 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.267


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-05-23T00:00:00ANONYMOUSv4_computersBF63569B9A9E5FFF0.162
1999-05-30T00:00:00Stephen Woodv4_computersBF63569B9A9E5FFF0.162


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-12T19:56:31Oliver KruseGTX-0C05307787A418F__no
2017-11-26T01:13:05kkmrkkblmbrbkc4.xlarge
2731930575739258097
C05307787A418F__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 4096 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
259
250
260
270
280
290
2100
Last modified: 2018-09-28T16:25:14+00:00