is 2 2811947 - 1
has 846481 decimal digits
takes 0.217 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L4EC1EE114A5D43CFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26710.567067.1642 %3600002873801701.79167.9954 %12.358669.7895 %
Target2630.567665.0794 %1500013000000.00951.7912 %0.577165.7049 %
Difference+4+9.9994+2.0848 %+345000+286080170+1.7821+6.2042%+11.7815+4.0847 %

Known prime factors (1 factor, 63.3 bits, 0.00225091% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2811947113104512780639578892063.2942011142329152
26 × 3 × 11 × 29 × 32836049
2009-03-2064328360490.88680.20040.3742

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-28ANONYMOUSv4_computers2048204800--0.0010.683%
2023-01-29USAFSSUSAFSACS360000287380170
skipped known factor: 11310451278063957889
--1.97411.278%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-02-14Sturle Sundemorovan.ifi2602610.055


ECM factoring results:
Total ECM effort:0.394 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.081
50000500000030.313


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16ANONYMOUSv4_computers4EC1EE114A5D43CF0.217


PRP results:
dateuseridcompidcofactorsres64
2017-10-21Oliver KruseGTX-2
11310451278063957889
1FE6C121BE6A1673
2017-12-06kkmrkkblmbrbkc4.xlarge
11310451278063957889
1FE6C121BE6A1673


CERT results:
No CERT results for M2811947


P-1 factor-bounds graph:
B1 = 360000, B2 = 287380170 (P-1 stage 2)
B1 = 360000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
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