is 2 78647683 - 1
has 23675312 decimal digits
takes 245.419 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L276CE87148ED6C__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27597.293564.0000%660000132000006.07763.7235%103.371165.3404%1.3404%
PrimeNet2716.078761.9718%340000160000005.39895.2360%11.477663.9630%1.9911%
GPU7227597.293564.0000%500000170000006.32993.7747%103.623465.3589%1.3589%
Difference---+160000-3800000-0.2523-0.0513%-0.2523-0.0185%-0.0185%

Known prime factors:
No known factors for M78647683

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-06-25T12:52:49James Heinrich3930K660000132000006---6.078--3.723%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-02-24T00:00:00Jocelyn Larouchev4_computers21257--0.000--
2008-01-15T00:00:001997rj7v4_computers21263--0.020--
2008-03-11T00:00:001997rj7v4_computers21264--0.045--
2010-11-06T15:01:00hreidacer9264265--0.048--
2010-11-14T01:20:00PrimeCruncherApollo8265266--0.095--
2010-11-18T09:27:00Donna Nobleq8200v2266267--0.190--
2010-11-24T07:03:00ANONYMOUS267268--0.380--
2011-01-29T15:09:00Helmut Zulusko-server268269--0.760--
2011-02-07T12:04:00Martin Prusazak5269270--1.520--
2013-06-01T03:43:00ITSCP_-_Server3270271--3.040--
2015-08-26T13:36:00RichD0Manual testing271272--6.081--
2016-06-10T22:20:26AirSquirrelsManual testing272273--12.16--
2016-06-10T23:20:28AirSquirrelsManual testing273274--24.32--
2016-06-11T01:25:28AirSquirrelsManual testing274275--48.65--


ECM factoring results:
No ECM results for M78647683


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2018-03-17T12:52:50Henning GerhardtOffice276CE87148ED6C__245.4


PRP results:
No PRP results for M78647683


P-1 factor-bounds graph:
B1 = 660000, B2 = 13200000 (P-1 stage 2)
B1 = 660000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-03-17T12:52:50+00:00