is 2 2780521 - 1
has 837021 decimal digits
takes 0.215 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
Actual26710.686567.1642%----10.686567.1642%0.0000%
PrimeNet2590.027662.7119%120002200000.00262.8582%0.030263.7776%1.0658%
GPU722630.574065.0794%150002400000.00311.7475%0.577165.6896%0.6102%
Difference+4+10.1125+2.0848%-15000-240000-0.0031-1.7475%+10.1094+1.4746%+1.4746%

Known prime factors (1 factor, 40.8 bits, 0.00146748% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
278052119190043733611340.803345080
23 × 5 × 8627
-886278.917e-85.349e-59.828e-5

P-1 results:
No P-1 results for M2780521


Trial Factoring results:
No TF results for M2780521


ECM factoring results:

Old Calculation Method

Total ECM effort:0.312 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.312 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.312


Lucas-Lehmer results:
No L-L results for M2780521


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-21T05:53:05Oliver KruseGTX-3
1919004373361
644987E3D8989A__no
2017-12-06T07:19:45kkmrkkblmbrbkc4.xlarge
1919004373361
644987E3D8989A__no


P-1 factor-bounds graph:
100
101
100
101
102
103
104
TF factor-bounds graph:
267
240
250
260
270
280
290
2100
Last modified: 2018-04-24T19:12:46+00:00