is 2 1822673 - 1
has 548680 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-LE9DC2F501416AC6Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26832.701969.1176%18226731822673000.91677.9981%33.618671.5877%2.4700%
PrimeNet2570.010563.1579%80001500000.00122.8769%0.011864.2178%1.0599%
GPU722610.168565.5738%90001300000.00121.5583%0.169866.1103%0.5365%
Difference+7+32.5334+3.5439%+1813673+182137300+0.9155+6.4398%+33.4489+5.4774%+5.4774%

Known prime factors:
No known factors for M1822673

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-10-02T10:51:00harleeP4_26001000001675000---0.015--2.208%
2014-05-19T21:00:00Jocelyn LaroucheManual testing135214135214---0.011--0.924%
2014-09-22T21:00:00Jocelyn LaroucheManual testing170428170428---0.013--1.050%
2015-06-08T02:55:00mikrMSI278000091760000---0.600--7.487%
2018-09-10T11:51:59Jocelyn Larouchelow 4M182267318226730012---0.917--7.998%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:53Mark RoseManual testing258260--0.063--
2010-04-11T14:32:00Architects CubedManual testing260261--0.084--
2016-02-23T16:28:53Mark RoseManual testing261262--0.169--
2011-03-08T05:14:00GrunwalderGIMPManual testing21263--0.876--
2016-02-23T16:28:53Mark RoseManual testing262263--0.539--
2015-04-25T06:39:00snme2pm1Manual testing263264--1.077--
2015-04-25T06:39:00snme2pm1Manual testing264265--2.050--
2015-09-03T11:06:00ramgeisManual testing265266--4.100--
2018-05-28T14:40:34TJAOIManual testing266267--8.200--
2019-07-08T14:45:03TJAOIManual testing267268--16.40--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.471 GHz-days
Estimated T-Level:24.875
DigitsB1CurvesCompleteFacMiss
2011000273 / 1002.7306.433%
2550000273 / 2800.97537.653%

New Calculation Method

Total ECM effort:19.471 GHz-days
Estimated T-Level:24.875
DigitsB1CompleteFacMiss
201100010.7280.002%
25500000.99137.125%
302500000.06393.930%
3510000000.00399.707%


ECM Summary

B1B2factorcurvesGHz-days
50000500000020213.95
500006600000715.525


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00Ethan O'Connorv4_computersE9DC2F501416AC6D0.099
2015-07-18T18:31:00MadPooManual testingE9DC2F501416AC6D0.099


PRP results:
No PRP results for M1822673


P-1 factor-bounds graph:
B1 = 1822673, B2 = 182267300 (P-1 stage 2)
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 1822673 (P-1 stage 1)
B1 = 100000, B2 = 1675000 (P-1 stage 2)
B1 = 170428 (P-1 stage 1)
B1 = 135214 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-04-23T12:18:20+00:00