is 2 1803563 - 1
has 542927 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA2A90548EC1073ADdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.048469.1176%30000003930000001.90749.2815%34.955871.9840%2.8663%
PrimeNet2570.010663.1579%80001500000.00122.8712%0.011964.2157%1.0578%
GPU722610.170365.5738%90001300000.00121.5550%0.171566.1091%0.5353%
Difference+7+32.8781+3.5439%+2991000+392870000+1.9062+7.7265%+34.7843+5.8749%+5.8749%

Known prime factors:
No known factors for M1803563

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers25000387500---0.004--1.035%
2011-02-10T06:34:00Carsten Kossendeyleela1000001650000---0.015--2.196%
2014-05-12T10:21:00Jocelyn LaroucheManual testing135587135587---0.011--0.924%
2014-09-20T22:31:00Jocelyn LaroucheManual testing171174171174---0.013--1.051%
2015-05-01T22:43:00mikrMSI278000091760000---0.600--7.479%
2018-09-19T11:52:22Jocelyn Larouchelow 4M180356318035630012---0.907--7.970%
2021-07-12T19:37:07Dylan Delgadolaptop-ryzen737003000000393000000---1.907--9.281%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:52Mark RoseManual testing258260--0.064--
2010-04-12T07:30:00Architects Cubedm1_tt260261--0.085--
2016-02-23T16:28:52Mark RoseManual testing261262--0.170--
2010-12-13T03:33:00GrunwalderGIMPManual testing21263--0.885--
2016-02-23T16:28:52Mark RoseManual testing262263--0.544--
2015-04-20T21:13:00snme2pm1Manual testing263264--1.089--
2015-04-20T21:13:00snme2pm1Manual testing264265--2.072--
2015-08-31T08:30:00ramgeisManual testing265266--4.143--
2018-05-28T14:40:34TJAOIManual testing266267--8.287--
2019-07-15T09:27:30TJAOIManual testing267268--16.57--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.549 GHz-days
Estimated T-Level:24.804
DigitsB1CurvesCompleteFacMiss
2011000269 / 1002.6906.697%
2550000269 / 2800.96138.196%

New Calculation Method

Total ECM effort:18.549 GHz-days
Estimated T-Level:24.804
DigitsB1CompleteFacMiss
201100010.3460.003%
25500000.95738.393%
302500000.06094.141%
3510000000.00399.718%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026918.55


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01T00:00:00ANONYMOUSv4_computersA2A90548EC1073AD0.098
2015-07-01T17:35:00MadPooManual testingA2A90548EC1073AD0.098


PRP results:
No PRP results for M1803563


P-1 factor-bounds graph:
B1 = 3000000, B2 = 393000000 (P-1 stage 2)
B1 = 1803563, B2 = 180356300 (P-1 stage 2)
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 2780000 (P-1 stage 1)
B1 = 1803563 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 171174 (P-1 stage 1)
B1 = 135587 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 25000, B2 = 387500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-07-12T19:37:07+00:00