is 2 1802909 - 1
has 542730 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-L81383BDF47F9A78Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.481168.6567 %500000150000000.10155.0595 %16.582670.2425 %
Target2610.170465.5738 %90006500000.00351.5549 %0.173866.1091 %
Difference+6+16.3107+3.0829 %+491000+14350000+0.0980+3.5046%+16.4087+4.1335 %

Known prime factors (3 factors, 212.3 bits, 0.01177478% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18029096074967910426798182072169.041168476831343867
3 × 41 × 491 × 2789674819
2021-01-29491278967481966.21911.95622.330
18029096304501958972872629292169.095174842489525896
23 × 21855311190737
2013-07-1382185531119073766.21993,666174,943
1802909209921336141605904377192374.1525821739648024551
19 × 306407349896029
2021-01-29193064073498960292,122.11,313,1852,452,664

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-21Team Prime Ribv4_computers25000387500--0.0042.762%
2003-09-21Xyzzyv4_computers25000387500--0.0042.762%
2011-02-11Carsten Kossendeymother10000016500006--0.0154.919%
2016-03-16alpertronManual testing5000001500000012---8.850%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-25ANONYMOUSv4_computers212580.021
2022-03-09LordJuliusManual testing21260
2022-03-08LordJuliusManual testing258260
2010-04-11Architects Cubedm1_tt2602610.085
2010-12-13GrunwalderGIMPManual testing212630.885


ECM factoring results:
Total ECM effort:38.550 GHz-days
Estimated T-Level:25.714
DigitsB1CompleteFacMiss
201100014.7080.000%
25500001.67318.766%
302500000.14386.697%
3510000000.01099.015%


ECM Summary

B1B2factorcurvesGHz-days
10.207
50000500000022715.50
50000500000060.414
500005000000221.517
250000400000004920.92


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27ANONYMOUSv4_computers81383BDF47F9A78E0.098


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-0
630450195897287262929
52BD3B8362141EF1
2017-11-05kkmrkkblmbrbkc4.xlarge
630450195897287262929
52BD3B8362141EF1
2021-01-29riccardo ubertiColab_noGPU12
630450195897287262929
607496791042679818207
20992133614160590437719
46B540063A7E57BB


CERT results:
dateuseridcompid
2021-01-29PPed72Unimi


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 25000, B2 = 387500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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1010
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TF factor-bounds graph:
263
261
260
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00