is 2 5153257 - 1
has 1551285 decimal digits
takes 0.714 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L0E6EFFE9D8A56604double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.766065.6716%550009350000.02072.2487%5.786766.4436%0.7720%
PrimeNet2610.059662.2951%220005000000.00973.4153%0.069363.5828%1.2878%
GPU722651.415764.6154%360008000000.01562.5425%1.431365.5151%0.8997%
Difference+2+4.3503+1.0563%+19000+135000+0.0051-0.2938%+4.3554+0.9285%+0.9285%

Known prime factors (1 factor, 86.6 bits, 0.00168001% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
51532571152951503815755802993145532786.57511186629192137669468
22 × 3 × 11 × 19 × 149 × 179 × 3313 × 50479027
2014-07-263313504790274,691,9530.55341.0324

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-09-26T22:04:00harleeP4_260055000935000---0.021--2.249%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21T00:00:00ANONYMOUSv4_computers21261--0.060--
2008-10-11T16:11:00Sturle Sundeklengel.ifi261262--0.060--
2009-06-25T01:18:00GrunwalderGIMPManual testing262263--0.190--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.632 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.632 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.09790.776%
25500000.00999.129%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.632


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-09-06T00:00:00ANONYMOUSv4_computers0E6EFFE9D8A566040.714
2000-08-17T00:00:00ANONYMOUSv4_computers0E6EFFE9D8A566040.714


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T19:15:46kkmrkkblmbrbkManual testing
115295150381575580299314553
19008D8FF5EEF4__no
2018-05-21T09:34:15Oliver KruseGTX-4
115295150381575580299314553
19008D8FF5EEF4__no


P-1 factor-bounds graph:
B1 = 55000, B2 = 935000 (P-1 stage 2)
B1 = 55000 (P-1 stage 1)
102
103
104
105
102
103
104
105
106
107
108
TF factor-bounds graph:
267
263
262
261
250
260
270
280
290
2100
Last modified: 2018-05-21T09:34:15+00:00