is 2 78647761 - 1
has 23675336 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-LC5C4C9277281EF__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27597.293464.0000%660000123750005.87433.6746%103.167765.3229%1.3229%
PrimeNet2716.078761.9718%340000160000005.39895.2360%11.477663.9630%1.9911%
GPU7227597.293464.0000%500000170000006.32993.7747%103.623365.3589%1.3589%
Difference---+160000-4625000-0.4556-0.1001%-0.4556-0.0361%-0.0361%

Known prime factors:
No known factors for M78647761

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-07-18T03:54:18markrManual testing66000012375000---5.874--3.675%


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--
2010-11-06T15:55:00hreidacer9264265--0.048--
2010-11-15T14:05:00arnaudSRV-330265266--0.095--
2010-11-20T01:18:00arnaudSRV-330266267--0.190--
2010-11-24T20:56:00Craig MeyersManual testing267268--0.380--
2010-11-25T05:01:00sannerud.comJimEmcLap268269--0.760--
2010-11-25T05:15:00sannerud.comJimEmcLap269270--1.520--
2013-01-13T22:54:00fennectou1hou2270271--3.040--
2015-08-26T13:36:00RichD0Manual testing271272--6.081--
2016-07-02T07:45:35AirSquirrelsManual testing272273--12.16--
2016-07-02T08:20:36AirSquirrelsManual testing273274--24.32--
2016-07-02T09:40:35AirSquirrelsManual testing274275--48.65--


ECM factoring results:
No ECM results for M78647761


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2017-10-28T23:26:53-Anonymous-C5C4C9277281EF__245.4


PRP results:
No PRP results for M78647761


P-1 factor-bounds graph:
B1 = 660000, B2 = 12375000 (P-1 stage 2)
B1 = 660000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
275
274
273
272
271
270
269
268
267
266
265
264
263
257
250
260
270
280
290
2100
Last modified: 2017-10-28T23:26:53+00:00