is 2 1809971 - 1
has 544856 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LBD0096DC99230F88double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.416868.6567 %500000150000000.10155.0619 %16.518370.2433 %
Target2610.169765.5738 %90006500000.00351.5561 %0.173266.1095 %
Difference+6+16.2471+3.0829 %+491000+14350000+0.0980+3.5057%+16.3451+4.1338 %

Known prime factors (1 factor, 68.6 bits, 0.00378750% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18099714329241132119774696312168.553119594212617765
3 × 5 × 349 × 22845121799
2008-09-163492284512179932.93197.909182.87

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012---8.854%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-16ANONYMOUSv4_computers212580.021


ECM factoring results:
Total ECM effort:39.165 GHz-days
Estimated T-Level:25.707
DigitsB1CompleteFacMiss
201100015.1030.000%
25500001.68218.604%
302500000.14186.818%
3510000000.01099.040%


ECM Summary

B1B2factorcurvesGHz-days
10.155
50000470000070.471
500005000000312.139
50000650000021716.75
250000400000004619.65


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13ANONYMOUSv4_computersBD0096DC99230F880.098


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-3
432924113211977469631
1F4E8AE0D3E189DD
2017-11-05kkmrkkblmbrbkc4.xlarge
432924113211977469631
1F4E8AE0D3E189DD


CERT results:
No CERT results for M1809971


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
250
260
270
JSON version of this page
Last modified: 2024-03-03T02:29:32+00:00