is 2 4253203 - 1
has 1280342 decimal digits
takes 0.530 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3E5785538DCAB363double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2676.986265.6716%9500020425000.03642.9373%7.022666.6800%1.0083%
PrimeNet2610.072262.2951%180003600000.00662.9203%0.078863.3962%1.1011%
GPU722651.715364.6154%240004500000.00851.9236%1.723965.2961%0.6807%
Difference+2+5.2709+1.0563%+71000+1592500+0.0278+1.0137%+5.2987+1.3839%+1.3839%

Known prime factors (1 factor, 63.1 bits, 0.00148245% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
425320395588736799374849191963.0521123726480953
3 × 374575493651
2013-02-1733745754936510.39053,690.76,893.2

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-05-13T00:00:00ANONYMOUSv4_computers20000160000---0.005--1.003%
2010-09-04T14:54:00markrtiny950002042500---0.036--2.937%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-05-23T00:00:00ANONYMOUSv4_computers21260--0.036--
2002-01-15T00:00:00ANONYMOUSv4_computers21261--0.072--
2011-01-07T23:33:00markroldgamer261262--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)
1998-07-05T00:00:00ANONYMOUSv4_computersC01C205670445E__0.530
2000-06-29T00:00:00ANONYMOUSv4_computersFB80CE82526F71__0.530
2001-07-22T00:00:00Pi_Rhov4_computers3E5785538DCAB3630.530


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T16:58:09kkmrkkblmbrbkManual testing
9558873679937484919
3B7789AFA70553__no
2018-01-24T06:46:11Oliver KruseGTX-7
9558873679937484919
3B7789AFA70553__no


P-1 factor-bounds graph:
B1 = 95000, B2 = 2042500 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
B1 = 20000, B2 = 160000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
100
101
102
103
104
105
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
263
262
261
260
250
260
270
280
290
2100
Last modified: 2018-01-24T06:46:11+00:00