is 2 1822981 - 1
has 548772 decimal digits
takes 0.099 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFB7842A37B790174double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271262.250870.4225%18229811822981000.91696.2132%263.167772.2602%1.8377%
PrimeNet2570.010563.1579%80001500000.00122.8770%0.011864.2179%1.0600%
GPU722610.168565.5738%90001300000.00121.5584%0.169766.1103%0.5365%
Difference+10+262.0823+4.8488%+1813981+182168100+0.9156+4.6548%+262.9980+6.1500%+6.1500%

Known prime factors (1 factor, 75.5 bits, 0.00414140% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1822981533116255156224247124392375.49714622101249443199
37 × 53 × 2879 × 2589944921
2020-07-19287925899449218,230.611.10020.731

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-09T16:51:00Carsten Kossendeyleela1000001675000---0.015--1.524%
2014-05-19T21:00:00Jocelyn LaroucheManual testing135208135208---0.011--0.607%
2014-09-22T21:00:00Jocelyn LaroucheManual testing170416170416---0.013--0.698%
2015-06-08T17:35:00mikrMSI278000091760000---0.600--5.819%
2018-08-21T18:27:41Jocelyn Larouchelow 4M182298118229810012---0.917--6.213%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:28:53Mark RoseManual testing21260--0.084--
2010-04-11T14:32:00Architects CubedManual testing260261--0.084--
2016-02-23T16:28:53Mark RoseManual testing261262--0.169--
2011-01-21T16:10:00GrunwalderGIMPManual testing21263--0.875--
2016-02-23T16:28:53Mark RoseManual testing262263--0.538--
2011-05-07T06:36:00XyzzyManual testing263264--1.077--
2011-05-07T06:36:00XyzzyManual testing264265--2.050--
2014-01-04T17:24:00Never Odd Or EvenManual testing265266--4.099--
2014-01-04T17:24:00Never Odd Or EvenManual testing266267--8.198--
2014-01-04T17:24:00Never Odd Or EvenManual testing267268--16.40--
2014-01-04T17:24:00Never Odd Or EvenManual testing268269--32.79--
2014-01-04T17:24:00Never Odd Or EvenManual testing269270--65.59--
2015-11-13T09:29:33ramgeisManual testing270271--131.2--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.216 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.216 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.3210.024%
25500000.75347.098%
302500000.04695.459%
3510000000.00299.787%


ECM Summary

B1B2factorcurvesGHz-days
50000500000014710.15
50000500000030.207
5000066000001017.860


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computersFB7842A37B7901740.099
2015-06-27T00:54:00MadPooManual testingFB7842A37B7901740.099


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-19T08:34:38CrypticClueManual testing
53311625515622424712439
F3FB37926120E315no
2020-07-20T20:17:20pewlaptop
53311625515622424712439
F3FB37926120E315no


P-1 factor-bounds graph:
B1 = 1822981, B2 = 182298100 (P-1 stage 2)
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 1822981 (P-1 stage 1)
B1 = 100000, B2 = 1675000 (P-1 stage 2)
B1 = 170416 (P-1 stage 1)
B1 = 135208 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-04-23T12:18:23+00:00