is 2 2553241 - 1
has 768603 decimal digits
takes 0.177 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.637767.1642%2000000600000000.51907.6637%12.156769.6806%2.5164%
PrimeNet2590.030162.7119%110002000000.00212.6859%0.032263.7134%1.0015%
GPU722630.625165.0794%120001800000.00211.4784%0.627265.5956%0.5163%
Difference+4+11.0126+2.0848%+1988000+59820000+0.5168+6.1853%+11.5295+4.0850%+4.0850%

Known prime factors (2 factors, 87.5 bits, 0.00342858% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2553241730226927929.444143
11 × 13
-11132.888e-111.117e-62.252e-6
25532413080688572297680971858.09660328981328
24 × 7 × 11 × 48968329
2015-08-1016489683290.01600.26830.5012

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
25532412249601749192952903949479192787.540
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-07-04T12:40:31alpertronManual testing20000006000000012-
skipped known factor: 730226927
skipped known factor: 308068857229768097
--0.519--7.664%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2015-08-10T11:19:00TJAOIManual testing258259*58.096180.0010.3590.002


ECM factoring results:

Old Calculation Method

Total ECM effort:0.277 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.277 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.277


Lucas-Lehmer results:
No L-L results for M2553241


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-15T20:26:07kkmrkkblmbrbkc4.xlarge
730226927
308068857229768097
C3E1CA9FF6859B__no
2017-11-10T21:46:41Oliver KruseGTX-2
730226927
308068857229768097
C3E1CA9FF6859B__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
259
220
230
240
250
260
270
280
290
2100
Last modified: 2019-07-04T12:40:31+00:00