is 2 18800567 - 1
has 5659535 decimal digits
takes 11.985 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1E9924835E57739Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual273101.744065.7534%100000018121278010.00036.2437%111.744367.8917%2.1382%
PrimeNet2650.388161.5385%9000028000000.21974.8255%0.607763.3944%1.8560%
GPU722696.350263.7681%13000036000000.29493.4748%6.645165.0271%1.2590%
Difference+4+95.3938+1.9853%+870000+177612780+9.7054+2.7689%+105.0992+2.8646%+2.8646%

Known prime factors (1 factor, 74.5 bits, 0.00039606% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18800567259944426312855804591912374.461691320709404285
3 × 5 × 17 × 2711061605507
2022-04-08172711061605507218.69136,536255,011

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-04-10T00:00:00ANONYMOUSv4_computers2250005512500---0.474--2.694%
2003-08-25T00:00:00ANONYMOUSv4_computers2250005512500---0.474--2.694%
2022-03-26T02:14:53masserManual testing1000000181212780---10.00--6.244%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-04-08T03:19:25masserManual testing200000420000065P+12374.4610.457
2022-04-11T03:41:11masserManual testing5000070000013571--0.098


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-20T00:00:00Net_Forcev4_computers21258--0.002--
2001-12-08T00:00:00Net_Forcev4_computers21259--0.004--
2002-03-16T00:00:00Team Prime Ribv4_computers21266--0.786--
2014-08-02T11:13:00NesowaManual testing266267--0.795--
2017-09-18T11:30:16ramgeisManual testing267268--1.590--
2017-09-18T11:30:16ramgeisManual testing268269--3.180--
2020-01-22T12:43:06lycornManual testing269270--6.360--
2021-09-12T16:51:02SRBaseManual testing270271--12.72--
2021-10-08T19:10:27-Anonymous-Manual testing271272--25.44--
2021-11-19T21:07:55-Anonymous-Manual testing272273--50.88--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.969 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.969 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03296.826%
25500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.969


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-05-19T00:00:00ANONYMOUSv4_computers1E9924835E57739E11.99
2003-08-25T00:00:00ANONYMOUSv4_computers1E9924835E57739E11.99
2007-02-20T00:00:00TheJudgerv4_computers1E9924835E57739E11.99


PRP results:
No PRP results for M18800567


P-1 factor-bounds graph:
B1 = 1000000, B2 = 181212780 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 225000, B2 = 5512500 (P-1 stage 2)
B1 = 200000, B2 = 4200000 (P+1 stage 2)
B1 = 225000 (P-1 stage 1)
B1 = 200000 (P+1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-11T03:41:11+00:00