is 2 55519187 - 1
has 16712941 decimal digits
takes 117.670 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L49562245044795ABdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27468.910764.8649%550000119625003.60113.7686%72.511866.1890%1.3241%
PrimeNet2692.150462.3188%240000100000002.37175.3618%4.522164.3392%2.0204%
GPU7227334.453864.3836%360000120000003.05533.9348%37.509165.7850%1.4014%
Difference+1+34.4569+0.4813%+190000-37500+0.5458-0.1662%+35.0028+0.4040%+0.4040%

Known prime factors:
No known factors for M55519187

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-06-20T02:13:00Jerry HallettP1Main55000011962500---3.601--3.769%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-12-15T00:00:00ANONYMOUSv4_computers21253--2.16128e-5--
2000-01-19T00:00:00ANONYMOUSv4_computers21253--2.16128e-5--
2000-03-01T00:00:00ANONYMOUSv4_computers21254--4.32255e-5--
2000-05-31T00:00:00ANONYMOUSv4_computers21256--0.000--
2001-09-30T00:00:00ANONYMOUSv4_computers21257--0.000--
2002-07-27T00:00:00ANONYMOUSv4_computers21258--0.001--
2008-07-02T00:22:00ANONYMOUSManual testing21264--0.064--
2009-03-09T21:55:00Gordon BowerPAIR264265--0.067--
2009-03-11T04:25:00Gordon BowerPAIR265266--0.135--
2009-03-12T06:47:00Gordon BowerPAIR266267--0.269--
2009-05-26T15:44:00Will Edgingtonganymede267268--0.538--
2011-04-08T18:05:00ANONYMOUS268269--1.077--
2012-03-22T08:16:00Craig MeyersManual testing269272--15.07--
2016-01-22T19:43:13ANONYMOUSManual testing272273--17.23--
2019-05-26T21:29:45TheJudgerManual testing273274--34.46--


ECM factoring results:
No ECM results for M55519187


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2012-11-27T03:39:00NoPaGIMPS149562245044795AB117.7
2020-07-28T05:43:38Roland ClarksonManual testing49562245044795AB117.7


PRP results:
No PRP results for M55519187


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: 2020-07-28T05:43:38+00:00