is 2 8121587 - 1
has 2444842 decimal digits
takes 2.121 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
Actual2687.339166.1765%----7.339166.1765%0.0000%
PrimeNet2630.196563.4921%360009000000.03153.6144%0.228064.8116%1.3195%
GPU722673.658665.6716%5500012000000.04442.5730%3.703166.5549%0.8833%
Difference+1+3.6804+0.5048%-55000-1200000-0.0444-2.5730%+3.6360-0.3784%-0.8833%

Known prime factors (1 factor, 58.9 bits, 0.00072526% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
81215875389306182801768971858.90333178898304
27 × 32 × 28801127
1998-11-07128288011270.00810.59411.1096

P-1 results:
No P-1 results for M8121587


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers??58.903180.0034.5020.007
2022-03-15T07:28:45FlaukrotistManual testing267268--3.680--


ECM factoring results:
No ECM results for M8121587


Lucas-Lehmer results:
No L-L results for M8121587


PRP results:
dateuseridcompidcofactorsres64PRP
2018-08-21T09:37:27Oliver KruseGTX-5
538930618280176897
4E9FE3E2934064__no
2020-02-12T17:00:57oodairacom2
538930618280176897
4E9FE3E2934064BFno


P-1 factor-bounds graph:
101
102
103
101
102
103
104
105
106
107
108
TF factor-bounds graph:
268
2
250
260
270
280
290
2100
Last modified: 2022-03-15T07:28:45+00:00