is 2 2586721 - 1
has 778681 decimal digits
takes 0.179 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
Actual26711.487167.1642%2000000600000000.51907.6739%12.006169.6840%2.5198%
PrimeNet2590.029762.7119%110002000000.00212.6923%0.031863.7158%1.0039%
GPU722630.617065.0794%120001900000.00221.5061%0.619265.6053%0.5259%
Difference+4+10.8701+2.0848%+1988000+59810000+0.5168+6.1679%+11.3869+4.0787%+1.9939%

Known prime factors (1 factor, 23.9 bits, 0.00092347% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
258672115520327823.8883
3
-134.323e-131.115e-72.047e-7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-07-04T12:41:41alpertronManual testing20000006000000012-
skipped known factor: 15520327
--0.519--7.674%


Trial Factoring results:
No TF results for M2586721


ECM factoring results:
Total ECM effort:0.277 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.277


Lucas-Lehmer results:
No L-L results for M2586721


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-15T11:52:32Oliver KruseGTX-0
15520327
9A7AF7AC1B3A92__no
2017-12-02T04:27:08kkmrkkblmbrbkc4.xlarge
15520327
9A7AF7AC1B3A92__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2019-07-04T12:41:41+00:00