is 2 2490251 - 1
has 749641 decimal digits
takes 0.173 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26711.932167.1642 %2000000600000000.51907.6441 %12.451169.6742 %
Target2630.640965.0794 %110008000000.00541.3810 %0.646365.5616 %
Difference+4+11.2912+2.0848 %+1989000+59200000+0.5135+6.2631%+11.8047+4.1126 %

Known prime factors (2 factors, 98.3 bits, 0.00394830% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
249025143479782471032.018873
32 × 97
-9972.732e-101.387e-61.842e-6
2490251911571179701718263512066.30518302797181925
32 × 52 × 81345765253
2018-03-0525813457652539.964445.74832.51

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2019-07-04alpertronManual testing20000006000000012
skipped known factor: 4347978247
---10.561%


Trial Factoring results:
5758596061626364656667
No TF results for M2490251


ECM factoring results:
Total ECM effort:5.725 GHz-days
Estimated T-Level:21.051
DigitsB1CompleteFacMiss
20110002.27610.273%
25500000.21081.050%
302500000.01398.674%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.276
50000500000020.184
500006732535505.266


Lucas-Lehmer results:
No L-L results for M2490251


PRP results:
dateuseridcompidcofactorsres64
2017-10-14Oliver KruseGTX-3
4347978247
2C636C676397660E
2017-11-30Yizhe Huangsoraz
4347978247
2C636C676397660E
2018-03-09Oliver KruseGTX-3
4347978247
91157117970171826351
2C636C676397660E


CERT results:
No CERT results for M2490251


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
109
1010
1011
TF factor-bounds graph:
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=21.05 ~= 53-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00