is 2 4254763 - 1
has 1280812 decimal digits
takes 0.531 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L093C8ADC5A225E86double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2676.983765.6716%300004000000.00911.4957%6.992866.1851%0.5135%
PrimeNet2610.072262.2951%180003600000.00662.9205%0.078863.3963%1.1012%
GPU722651.714764.6154%240004500000.00851.9238%1.723365.2961%0.6807%
Difference+2+5.2690+1.0563%+6000-50000+0.0005-0.4280%+5.2695+0.8890%+0.8890%

Known prime factors (1 factor, 101.0 bits, 0.00237435% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4254763257567813290173198912721001003331101.023302681739605911303300232
23 × 17 × 27583 × 80687417123375039
2013-02-1827583806874171233750394.360e+10795,017,6041.485e+9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-01-22T00:00:00ANONYMOUSv4_computers30000400000---0.009--1.496%
2002-11-24T00:00:00ANONYMOUSv4_computers30000400000---0.009--1.496%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-05-23T00:00:00ANONYMOUSv4_computers21260--0.036--
2002-01-15T00:00:00ANONYMOUSv4_computers21261--0.072--
2011-01-06T08:12:00markroldgamer261262--0.072--
2012-01-31T04:36:00GrunwalderGIMPManual testing21263--0.375--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.547 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.547 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.547


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-20T00:00:00ANONYMOUSv4_computers093C8ADC5A225E860.531
2000-11-25T00:00:00ANONYMOUSv4_computers093C8ADC5A225E860.531


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T16:58:11kkmrkkblmbrbkManual testing
2575678132901731989127210010033
CDA38EB36C50DA__no
2018-01-22T14:18:00ATHec2-1xf
2575678132901731989127210010033
CDA38EB36C50DA__no


P-1 factor-bounds graph:
B1 = 30000, B2 = 400000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
103
104
105
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
1016
1017
TF factor-bounds graph:
267
263
262
261
260
250
260
270
280
290
2100
2110
Last modified: 2018-01-22T14:18:00+00:00