is 2 55442731 - 1
has 16689926 decimal digits
takes 117.508 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8E024DEA18830013double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27469.005764.8649%550000118250003.57813.7591%72.583866.1856%1.3208%
PrimeNet2692.153362.3188%240000100000002.37175.3609%4.525164.3389%2.0201%
GPU7227334.501364.3836%360000120000003.05533.9341%37.556665.7847%1.4012%
Difference+1+34.5045+0.4813%+190000-175000+0.5228-0.1749%+35.0273+0.4009%+0.4009%

Known prime factors:
No known factors for M55442731

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-07-10T18:51:00monstharp55000011825000---3.578--3.759%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-12-15T00:00:00ANONYMOUSv4_computers21253--2.16426e-5--
2000-01-19T00:00:00ANONYMOUSv4_computers21253--2.16426e-5--
2000-03-01T00:00:00ANONYMOUSv4_computers21254--4.32851e-5--
2000-05-31T00:00:00ANONYMOUSv4_computers21256--0.000--
2001-09-22T00:00:00ANONYMOUSv4_computers21257--0.000--
2002-07-20T00:00:00ANONYMOUSv4_computers21258--0.001--
2016-02-23T16:40:20Mark RoseManual testing258263--0.028--
2008-12-22T19:18:001997rj7compw263264--0.035--
2009-01-03T12:11:00Sturle Sundegerle.ifi264265--0.067--
2009-01-10T07:05:00Scott KurowskiD-4100265266--0.135--
2009-01-10T17:31:00Sturle Sundeinteravia.ifi266267--0.270--
2009-05-15T23:27:00Sturle Sundenardi.ifi267268--0.539--
2011-04-06T05:03:00GrunwalderGIMPcompute-0-4268269--1.078--
2011-05-28T00:12:00GrunwalderGIMPvangelis269270--2.157--
2012-04-01T13:23:00GregManual testing270271--4.313--
2012-04-01T16:23:00GregManual testing271272--8.626--
2016-01-22T19:42:45ANONYMOUSManual testing272273--17.25--
2019-05-26T21:33:13TheJudgerManual testing273274--34.50--


ECM factoring results:
No ECM results for M55442731


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2012-08-30T18:28:00Albrecht HeefferI5-25008E024DEA18830013117.5
2020-04-13T15:27:15-Anonymous-8E024DEA18830013117.5


PRP results:
No PRP results for M55442731


P-1 factor-bounds graph:
B1 = 550000, B2 = 11825000 (P-1 stage 2)
B1 = 550000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-04-13T15:27:15+00:00