is 2 55442879 - 1
has 16689970 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-L0A178D6C7B90E238double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27469.005564.8649%550000119625003.60113.7680%72.606766.1887%1.3239%
PrimeNet2692.153362.3188%240000100000002.37175.3609%4.525164.3389%2.0201%
GPU7227334.501264.3836%360000120000003.05533.9341%37.556565.7847%1.4012%
Difference+1+34.5044+0.4813%+190000-37500+0.5458-0.1661%+35.0502+0.4040%+0.4040%

Known prime factors:
No known factors for M55442879

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-04-09T20:35:00Donna Noble3570K-black55000011962500---3.601--3.768%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-12-15T00:00:00ANONYMOUSv4_computers21253--2.16425e-5--
2000-01-19T00:00:00ANONYMOUSv4_computers21253--2.16425e-5--
2000-03-01T00:00:00ANONYMOUSv4_computers21254--4.32850e-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--
2008-12-22T20:37:001997rj7compw263264--0.035--
2009-01-06T16:19:00ANONYMOUS264265--0.067--
2009-01-10T18:21:00ANONYMOUSMichelle265266--0.135--
2009-03-12T21:22:00Sturle Sundegoomba.ifi266267--0.270--
2009-05-15T23:12:00Sturle Sundetumbili.ifi267268--0.539--
2011-04-05T11:20:00lexatrefalt_d268269--1.078--
2011-06-22T15:51:00oilwarzonedotcomamdtoshfromchris269270--2.157--
2012-04-01T22:23:00GregManual testing270271--4.313--
2012-04-02T01:23:00GregManual testing271272--8.626--
2014-02-01T00:40:00Bill StaffenManual testing272273--17.25--
2014-08-05T06:16:00NickOfTimeManual testing273274--34.50--


ECM factoring results:
No ECM results for M55442879


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2014-09-20T16:12:00Kevin JagetPokey0A178D6C7B90E238117.5
2020-01-28T09:56:56sclice.ky7k.net0A178D6C7B90E238117.5


PRP results:
No PRP results for M55442879


P-1 factor-bounds graph:
B1 = 550000, B2 = 11962500 (P-1 stage 2)
B1 = 550000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-01-28T09:56:56+00:00