is 2 4253429 - 1
has 1280410 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-LACF857589371CA67double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2676.985965.6716%500007625000.01612.0241%7.001966.3665%0.6948%
PrimeNet2610.072262.2951%180003600000.00662.9203%0.078863.3962%1.1011%
GPU722651.715364.6154%240004500000.00851.9236%1.723865.2961%0.6807%
Difference+2+5.2706+1.0563%+26000+312500+0.0075+0.1005%+5.2781+1.0704%+1.0704%

Known prime factors (1 factor, 65.5 bits, 0.00153936% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4253429512949304257383436492065.4756029832686256
24 × 33 × 17 × 211 × 3891259
2013-02-1821138912591.88870.03840.0716

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-01T05:06:00Carsten Kossendeydurandal25000337500---0.008--1.354%
2011-08-18T18:25:00Squeeky_SquirrelT7500_220050000762500---0.016--2.024%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-05-23T00:00:00ANONYMOUSv4_computers21260--0.036--
2001-12-22T00:00:00ANONYMOUSv4_computers21261--0.072--
2011-01-07T16:40:00markroldgamer261262--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)
1998-06-01T00:00:00ANONYMOUSv4_computersACF857589371CA670.530
2000-04-19T00:00:00S10747v4_computersACF857589371CA670.530


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T16:58:09kkmrkkblmbrbkManual testing
51294930425738343649
463971B22FBEC0__no
2018-01-23T22:47:13Oliver KruseGTX-2
51294930425738343649
463971B22FBEC0__no


P-1 factor-bounds graph:
B1 = 50000, B2 = 762500 (P-1 stage 2)
B1 = 50000 (P-1 stage 1)
B1 = 25000, B2 = 337500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
101
102
103
104
105
101
102
103
104
105
106
107
TF factor-bounds graph:
267
263
262
261
260
250
260
270
280
290
2100
Last modified: 2018-01-23T22:47:13+00:00