is 2 1825217 - 1
has 549446 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-L8D4DE6B12D048B98double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.279768.6567 %60000001200000000.96068.8994 %17.240271.4461 %
Target2610.168365.5738 %90007000000.00371.5937 %0.172066.1224 %
Difference+6+16.1114+3.0829 %+5991000+119300000+0.9569+7.3057%+17.0682+5.3237 %

Known prime factors (3 factors, 218.1 bits, 0.01194678% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1825217129210677568616124092063.4863539597690812
22 × 4049 × 218547647
2008-09-2940492185476470.87440.93691.7494
1825217883729440067559449330632376.22624208886945156643
33 × 79 × 11349689144471
2020-05-2079113496891444718,384.848,64290,850
18252173831682964975518193508792478.342104965134692902767
35 × 181 × 96661 × 24689309
2021-04-02966612468930933,5390.11300.1976

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012---8.862%
2021-04-03riccardo ubertiColab_noGPU14600000012000000012
skipped known factor: 383168296497551819350879
---13.747%


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


ECM factoring results:
Total ECM effort:38.983 GHz-days
Estimated T-Level:25.701
DigitsB1CompleteFacMiss
201100015.0610.000%
25500001.67518.731%
302500000.14086.917%
3510000000.01099.052%


ECM Summary

B1B2factorcurvesGHz-days
10.103
500005000000201.381
500005000000130.898
50000660000020816.19
500006600000151.168
250000400000004519.24


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10JCv4_computers8D4DE6B12D048B980.099


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-1
12921067756861612409
E6340C944C44ED5F
2017-11-11kkmrkkblmbrbkc4.xlarge
12921067756861612409
E6340C944C44ED5F
2020-05-20M Millercruncher
12921067756861612409
88372944006755944933063
15577B865DCA9498
2020-05-21Luigi Morelli9800X
12921067756861612409
88372944006755944933063
15577B865DCA9498
2021-04-02riccardo ubertiColab_noGPU12
12921067756861612409
88372944006755944933063
383168296497551819350879
15577B865DCA9498


CERT results:
dateuseridcompid
2021-04-02Yoonzinnia


P-1 factor-bounds graph:
B1 = 6000000, B2 = 120000000 (P-1 stage 2)
B1 = 6000000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
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Last modified: 2024-03-03T02:29:32+00:00