is 2 3928487 - 1
has 1182593 decimal digits
takes 0.490 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2677.563767.1642 %10000001507968001.65688.6223 %9.220569.9954 %
Target2640.906065.6250 %2600025000000.02912.2808 %0.935166.4090 %
Difference+3+6.6577+1.5392 %+974000+148296800+1.6277+6.3415%+8.2854+3.5864 %

Known prime factors (3 factors, 177.3 bits, 0.00451393% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3928487102140663926.60613
13
-1132.282e-122.991e-73.681e-7
39284875325132217743811671858.88667775866609
112 × 560131129
2015-10-091215601311290.01955.519010.308
392848744245581550767894327977679132891.838563137685714218913388
22 × 34 × 8849 × 12601 × 83933 × 185711
2022-05-2383933185711245,029,3650.01620.0309

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-03-02JossManual testing9000090000
skipped known factor: 102140663
--0.0141.473%
2022-03-22JossManual testing100000100000
skipped known factor: 102140663
--0.0161.556%
2022-05-23JossManual testing10000011986065022891.8381.1988.076%
2022-10-04JossManual testing1000000150796800
skipped known factor: 102140663
skipped known factor: 4424558155076789432797767913
--1.74910.998%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2015-10-09TJAOIManual testing258259*
58.886
18
0.009


ECM factoring results:
Total ECM effort:0.474 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.474


Lucas-Lehmer results:
No L-L results for M3928487


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
102140663
532513221774381167
0700E03C38DC518D
2017-12-30Oliver KruseGTX-0
102140663
532513221774381167
0700E03C38DC518D
2022-05-29Poaooffice-CN2
102140663
532513221774381167
4424558155076789432797767913
7A0D8D79CFBA7EB4


CERT results:
dateuseridcompid
2022-05-30blaqblaq


P-1 factor-bounds graph:
B1 = 1000000, B2 = 150796800 (P-1 stage 2)
B1 = 100000, B2 = 119860650 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (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:
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
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2100
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Last modified: 2024-03-13T02:15:48+00:00