is 2 1080901 - 1
has 325384 decimal digits
takes 0.032 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE13921E3903D741Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26727.490068.6567%300000100000000.03564.1055%27.525669.9435%1.2868%
PrimeNet2560.008962.5000%4500650000.00032.0201%0.009263.2575%0.7575%
GPU722600.142165.0000%4500200000.00020.6528%0.142365.2285%0.2285%
Difference+7+27.3479+3.6567%+295500+9980000+0.0354+3.4527%+27.3832+4.7150%+4.7150%

Known prime factors (1 factor, 61.8 bits, 0.00572110% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
108090141260693926372810171961.8391908625023308
22 × 477156255827
2008-03-1744771562558270.40281,117.22,086.7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-03-03T00:00:00Jocelyn Larouchev4_computers15000172500---0.001--0.707%
unknown30000010000000---0.036--4.105%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-24T00:00:00ANONYMOUSv4_computers21257--0.018--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.488 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000322 / 1003.2203.931%
2550000322 / 2801.15031.599%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:17.488 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100014.6920.000%
25500001.60920.008%
302500000.13187.737%
3510000000.00999.133%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002789.76
25000025000000447.726


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-03-16T00:00:00ANONYMOUSv4_computersE13921E3903D741D0.032


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T23:40:31Oliver KruseGTX-1
4126069392637281017
603F3F7A717E74__no
2017-10-16T07:56:32Oliver KruseThreadripper
4126069392637281017
603F3F7A717E74__no
2018-01-02T09:18:15ATHec2-1xf
4126069392637281017
603F3F7A717E74__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 15000, B2 = 172500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-04-09T16:08:57+00:00