is 2 4978121 - 1
has 1498564 decimal digits
takes 0.690 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
Actual2675.968965.6716%----5.968965.6716%0.0000%
PrimeNet2610.061762.2951%220004500000.00913.3108%0.070863.5434%1.2483%
GPU722651.465664.6154%340007000000.01412.4142%1.479765.4696%0.8543%
Difference+2+4.5033+1.0563%-34000-700000-0.0141-2.4142%+4.4892+0.2020%+0.2020%

Known prime factors (1 factor, 36.3 bits, 0.00072960% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4978121858128497991136.3208619
3 × 132 × 17
-1691693.431e-93.397e-56.913e-5

P-1 results:
No P-1 results for M4978121


Trial Factoring results:
No TF results for M4978121


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
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.632


Lucas-Lehmer results:
No L-L results for M4978121


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T16:59:36kkmrkkblmbrbkManual testing
85812849799
E301EB456C0A41__no
2018-04-22T06:35:10BattlemaxxWork-2
85812849799
E301EB456C0A41__no


P-1 factor-bounds graph:
101
102
103
101
102
103
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2019-08-25T18:30:09+00:00