is 2 2280403 - 1
has 686470 decimal digits
takes 0.150 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L7CF14698B8F924ABdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26713.030167.1642 %500000150000000.12305.2044 %13.153168.8731 %
Target2620.269464.5161 %1200010000000.00631.7346 %0.275765.1316 %
Difference+5+12.7607+2.6481 %+488000+14000000+0.1167+3.4698%+12.8774+3.7415 %

Known prime factors (1 factor, 77.2 bits, 0.00338727% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
22804031788808249162634236908972477.24339221318538053016
23 × 3 × 53 × 839 × 35537 × 1034171
2011-01-1535537103417119,6280.00860.0100

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-04-27ANONYMOUSv4_computers204820480012--0.0010.787%
2010-11-07JossManual testing1500015000--0.0010.584%
2010-11-14JossManual testing2000020000--0.0020.720%
2010-11-24Oscar Östlin7501175011--0.0071.602%
2011-01-15Oscar Östlin2477.2430.0170.000%
2016-04-10alpertronManual testing5000001500000012
skipped known factor: 178880824916263423690897
---8.304%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-01-15Sturle Sundegowin.ifi2602610.067


ECM factoring results:
Total ECM effort:7.478 GHz-days
Estimated T-Level:21.480
DigitsB1CompleteFacMiss
20110003.2084.042%
25500000.29674.376%
302500000.01998.139%


ECM Summary

B1B2factorcurvesGHz-days
50000500000060.375
50000531468170.618
50000652719770.678
500006600000505.005
50000700000080.802


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21nysvv4_computers7CF14698B8F924AB0.150
1999-05-02nysvv4_computers7CF14698B8F924AB0.150
1999-06-06nysvv4_computers7CF14698B8F924AB0.150


PRP results:
dateuseridcompidcofactorsres64
2017-10-11Oliver KruseGTX-1
178880824916263423690897
A51002D1BBC8E378
2017-11-22kkmrkkblmbrbkc4.xlarge
178880824916263423690897
A51002D1BBC8E378


CERT results:
No CERT results for M2280403


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
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
TF factor-bounds graph:
261
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=21.48 ~= 55-bit
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00