is 2 18403789 - 1
has 5540093 decimal digits
takes 11.196 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBD22A1B8643AEDD6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual273103.937565.7534%22000053350000.43992.6563%104.377466.6631%0.9097%
PrimeNet2650.396461.5385%8000026000000.19174.6557%0.588163.3291%1.7907%
GPU722696.487163.7681%13000036000000.28143.4644%6.768565.0233%1.2552%
Difference+4+97.4505+1.9853%+90000+1735000+0.1584-0.8080%+97.6089+1.6398%+1.6398%

Known prime factors:
No known factors for M18403789

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-04-19T00:00:00ANONYMOUSv4_computers2200005335000---0.440--2.656%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-25T00:00:00Net_Forcev4_computers21258--0.002--
2001-11-14T00:00:00Net_Forcev4_computers21259--0.004--
2002-11-24T00:00:00trifv4_computers21266--0.802--
2016-03-22T13:00:12Mark RoseManual testing266267--0.812--
2018-02-02T16:57:41ramgeisManual testing267268--1.624--
2018-02-02T16:57:41ramgeisManual testing268269--3.248--
2020-02-15T19:30:25lycornManual testing269270--6.497--
2021-09-11T15:50:21SRBaseManual testing270271--12.99--
2021-10-08T19:11:57-Anonymous-Manual testing271272--25.99--
2021-11-12T20:13:50-Anonymous-Manual testing272273--51.97--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.925 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.925 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.925


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-06-06T00:00:00ANONYMOUSv4_computersBD22A1B8643AEDD611.20
2006-12-18T00:00:00TheJudgerv4_computersBD22A1B8643AEDD611.20


PRP results:
No PRP results for M18403789


P-1 factor-bounds graph:
B1 = 220000, B2 = 5335000 (P-1 stage 2)
B1 = 220000 (P-1 stage 1)
104
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104
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107
TF factor-bounds graph:
273
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266
259
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2100
Last modified: 2021-11-12T20:13:50+00:00