is 2 2490889 - 1
has 749833 decimal digits
takes 0.173 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
Actual26711.929067.1642%2000000600000000.51907.6443%12.448069.6743%2.5101%
PrimeNet2590.030862.7119%100001800000.00192.5361%0.032863.6575%0.9457%
GPU722630.640765.0794%110001600000.00191.3811%0.642765.5616%0.4823%
Difference+4+11.2883+2.0848%+1989000+59840000+0.5170+6.2633%+11.8053+4.1126%+4.1126%

Known prime factors (2 factors, 96.9 bits, 0.00388860% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
249088974726671826.15515
3 × 5
-353.601e-123.127e-76.141e-7
249088919252844856740134796712270.706386465331388515
3 × 5 × 29 × 103 × 2089 × 4129007
2018-03-0420894129007148.610.02280.0423

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
24908891438701003423662185449400052413096.861
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-07-04T12:38:05alpertronManual testing20000006000000012-
skipped known factor: 74726671
skipped known factor: 1925284485674013479671
--0.519--7.644%


Trial Factoring results:
No TF results for M2490889


ECM factoring results:

Old Calculation Method

Total ECM effort:0.459 GHz-days
Estimated T-Level:0.250
DigitsB1CurvesCompleteFacMiss
20110005 / 1000.05095.099%
25500005 / 2800.01898.227%

New Calculation Method

Total ECM effort:0.459 GHz-days
Estimated T-Level:0.250
DigitsB1CompleteFacMiss
20110000.19282.505%
25500000.01898.236%
302500000.00199.888%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.276
50000500000020.184


Lucas-Lehmer results:
No L-L results for M2490889


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T07:07:09Oliver KruseGTX-2FDA80B0CC24DB1__no
2017-11-30T01:41:12storm55107700_Kaby_Lake
74726671
FDA80B0CC24DB1__no
2018-03-08T03:14:09Oliver KruseGTX-4
74726671
1925284485674013479671
FDA80B0CC24DB1__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
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108
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2019-07-04T12:38:05+00:00