is 2 1479031 - 1
has 445233 decimal digits
takes 0.056 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA1B3417E8889D240double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26720.090168.6567 %500000150000000.07144.9400 %20.161570.2051 %
Target2600.103865.0000 %65005000000.00181.4490 %0.105765.5071 %
Difference+7+19.9863+3.6567 %+493500+14500000+0.0696+3.4910%+20.0558+4.6979 %

Known prime factors (1 factor, 71.7 bits, 0.00485027% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
147903139355505082934006794472271.7371330448958910733
5004031 × 265875443
2010-01-085004031265875443385.741.06391.4978

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-29Team Prime Ribv4_computers20000270000--0.0022.643%
2016-03-17alpertronManual testing5000001500000012---9.463%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-05-27Jossv4_computers212570.013
2003-07-30ANONYMOUSv4_computers212580.026


ECM factoring results:
Total ECM effort:29.862 GHz-days
Estimated T-Level:25.701
DigitsB1CompleteFacMiss
201100014.5380.000%
25500001.64019.395%
302500000.14086.925%
3510000000.01099.024%


ECM Summary

B1B2factorcurvesGHz-days
10.127
50000500000024813.70
250000350000005016.03


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15Stephen Woodv4_computersA1B3417E8889D2400.056


PRP results:
dateuseridcompidcofactorsres64
2017-10-01Oliver KruseGTX-2
3935550508293400679447
F0AF79566DD592F6
2017-10-28kkmrkkblmbrbkc4.xlarge
3935550508293400679447
F0AF79566DD592F6


CERT results:
No CERT results for M1479031


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 20000, B2 = 270000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
TF factor-bounds graph:
258
257
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00