is 2 1819709 - 1
has 547787 decimal digits
takes 0.099 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LAFF884556EB31ED6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.328968.6567 %500000150000000.10155.0651 %16.430470.2443 %
Target2610.168865.5738 %90006500000.00351.5578 %0.172366.1101 %
Difference+6+16.1601+3.0829 %+491000+14350000+0.0980+3.5073%+16.2582+4.1342 %

Known prime factors (2 factors, 153.0 bits, 0.00840575% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18197091401071832079823969292166.92538497139709696
28 × 33 × 5569609333
2008-09-2725655696093338.115823.87044.582
1819709792764017413237442714388892686.03521782714088165674916
22 × 3 × 479 × 35944457 × 105429781
2021-03-26359444571054297818,612,0753.12535.7544

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012---8.859%


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


ECM factoring results:
Total ECM effort:38.958 GHz-days
Estimated T-Level:25.700
DigitsB1CompleteFacMiss
201100015.0260.000%
25500001.67218.793%
302500000.14086.935%
3510000000.01099.053%


ECM Summary

B1B2factorcurvesGHz-days
10.155
500005000000312.140
500006600000362.801
50000660000018814.63
250000400000004519.24


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17ANONYMOUSv4_computersAFF884556EB31ED60.099


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-2
140107183207982396929
6483628D0D255782
2017-11-06kkmrkkblmbrbkold
140107183207982396929
6483628D0D255782
2021-03-27Oliver KruseThreadripper-PC
140107183207982396929
79276401741323744271438889
866CC7B6D5406C05


CERT results:
dateuseridcompid
2021-03-27curtiscwcm220a-09l


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
107
108
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
250
260
270
280
290
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Last modified: 2024-03-03T02:29:32+00:00