is 2 2563643 - 1
has 771734 decimal digits
takes 0.178 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
Actual26711.590567.1642%----11.590567.1642%0.0000%
PrimeNet2590.030062.7119%110002000000.00212.6879%0.032163.7141%1.0023%
GPU722630.622665.0794%120001800000.00211.4796%0.624765.5960%0.5167%
Difference+4+10.9679+2.0848%-12000-180000-0.0021-1.4796%+10.9658+1.5681%+1.5681%

Known prime factors (2 factors, 109.4 bits, 0.00426664% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
256364315150976311431340.463295497
32 × 32833
-9328331.120e-70.00020.0003
25636435580423116986995995932168.919108837757772572
22 × 89 × 457 × 6569 × 101839
2018-03-18656910183942.5920.00120.0013

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
256364384548858453226339969691690692479933109.381
P-1 results:
No P-1 results for M2563643


Trial Factoring results:
No TF results for M2563643


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 M2563643


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-15T02:28:29Oliver KruseGTX-3
1515097631143
2F856A09E3F274__no
2017-12-01T18:24:49kkmrkkblmbrbkc4.xlarge
1515097631143
2F856A09E3F274__no
2018-03-22T17:01:45Oliver KruseGTX-7
1515097631143
558042311698699599593
2F856A09E3F274__no


P-1 factor-bounds graph:
100
101
102
103
104
100
101
102
103
104
105
106
TF factor-bounds graph:
267
240
250
260
270
280
290
2100
Last modified: 2018-03-22T17:01:45+00:00