is 2 2648189 - 1
has 797185 decimal digits
takes 0.205 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
Actual26711.220567.1642%2000000600000000.57797.6924%11.798369.6900%2.5259%
PrimeNet2590.029062.7119%110002000000.00242.7040%0.031463.7201%1.0083%
GPU722630.602765.0794%130002000000.00261.5745%0.605365.6292%0.5498%
Difference+4+10.6178+2.0848%+1987000+59800000+0.5753+6.1179%+11.1931+4.0608%+4.0608%

Known prime factors (1 factor, 26.9 bits, 0.00101660% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2648189127113073926.92224
23 × 3
-883.393e-128.959e-71.823e-6

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-07-04T12:47:41alpertronManual testing20000006000000012-
skipped known factor: 127113073
--0.578--7.692%


Trial Factoring results:
No TF results for M2648189


ECM factoring results:

Old Calculation Method

Total ECM effort:0.310 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.310 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.310


Lucas-Lehmer results:
No L-L results for M2648189


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-19T20:40:09kkmrkkblmbrbkold
127113073
E5711D41D47867__no
2017-11-14T13:15:39Oliver KruseThreadripper
127113073
E5711D41D47867__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: 2019-07-04T12:47:41+00:00