is 2 5143891 - 1
has 1548466 decimal digits
takes 0.713 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L1565CC6C161D3E84double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2675.776565.6716 %6000010650000.02312.3661 %5.799666.4839 %
Target2651.418364.6154 %3600040000000.05062.5418 %1.469065.5148 %
Difference+2+4.3582+1.0563 %+24000-2935000-0.0276-0.1757 %+4.3306+0.9691 %

Known prime factors (1 factor, 73.6 bits, 0.00143174% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5143891147926472756567794929912373.6471437884985865445
5 × 13 × 251 × 88132699103
2010-08-0225188132699103371.87965.081,802.5

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-10-07ANONYMOUSv4_computers25000312500--0.0081.819%
2009-09-22USAFSSP4_26006000010650006--0.0233.023%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-01-16ANONYMOUSv4_computers212610.030
2008-10-11Sturle Sunderumblebuffin.ifi2612620.095
2009-11-08S485122USB-W2622630.191


ECM factoring results:
Total ECM effort:0.263 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.263


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-07-29ANONYMOUSv4_computers1565CC6C161D3E840.713
2000-11-05ANONYMOUSv4_computers1565CC6C161D3E840.713


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
14792647275656779492991
81609E5D63F748B2
2018-05-15ATHec2-PRPCFDC
14792647275656779492991
81609E5D63F748B2


CERT results:
No CERT results for M5143891


P-1 factor-bounds graph:
B1 = 60000, B2 = 1065000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 312500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
101
102
103
104
105
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
263
262
261
this exponent TF target: 65
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-02-09T03:30:02+00:00