is 2 2896501 - 1
has 871934 decimal digits
takes 0.224 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L16C77577BB0022B6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26710.258667.1642 %2400002798523001.73307.5228 %11.991569.6343 %
Target2630.551065.0794 %1600015000000.01081.9086 %0.561965.7458 %
Difference+4+9.7075+2.0848 %+224000+278352300+1.7221+5.6142%+11.4297+3.8885 %

Known prime factors (1 factor, 68.1 bits, 0.00235038% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28965013116913117352152777832168.07953804799607391
7 × 233 × 15937 × 2069953
2011-01-2715937206995322.2360.01430.0236

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-12-02ANONYMOUSv4_computers2048204800--0.0010.688%
2009-07-03Carsten Kossendeymother15000168750--0.0031.588%
2010-12-24JossManual testing2000020000--0.0020.642%
2011-01-27Carsten Kossendeymother2168.0790.0520.000%
2023-04-16Kevin_9611Factor_2240000279852300
skipped known factor: 311691311735215277783
--2.02110.752%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-02-12Sturle Sundeduma.ifi2602610.053


ECM factoring results:
Total ECM effort:0.243 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.243


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-27ANONYMOUSv4_computers16C77577BB0022B60.224


PRP results:
dateuseridcompidcofactorsres64
2017-10-24Oliver KruseGTX-2
311691311735215277783
7BA468FB26F34FAA
2017-12-08kkmrkkblmbrbkc4.xlarge
311691311735215277783
7BA468FB26F34FAA


CERT results:
No CERT results for M2896501


P-1 factor-bounds graph:
B1 = 240000, B2 = 279852300 (P-1 stage 2)
B1 = 240000 (P-1 stage 1)
B1 = 15000, B2 = 168750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
TF factor-bounds graph:
261
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00