is 2 7985843 - 1
has 2403979 decimal digits
takes 2.085 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6587937ACA4CAED8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2673.720865.6716%10000019500000.07603.2180%3.796866.7763%1.1047%
PrimeNet2630.199963.4921%340009000000.03073.5651%0.230664.7936%1.3016%
GPU722673.720865.6716%5500012000000.04442.5661%3.765366.5525%0.8809%
Difference---+45000+750000+0.0316+0.6519%+0.0316+0.2238%+0.2238%

Known prime factors (1 factor, 64.7 bits, 0.00081074% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
7985843309024166487795997612064.7441934824955160
23 × 3 × 5 × 1051 × 15341143
2013-02-011051153411430.60370.31680.5910

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-07-27T00:00:00cbwoodv4_computers4000040000---0.015--0.674%
2012-06-26T14:10:00firejuggler1000001950000---0.076--3.218%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18T00:00:00ANONYMOUSv4_computers21262--0.077--
1998-10-25T00:00:00ANONYMOUSv4_computers21263--0.200--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-07T00:00:00ANONYMOUSv4_computers6587937ACA4CAED82.085
2002-09-07T00:00:00cbwoodv4_computers6587937ACA4CAED82.085


PRP results:
dateuseridcompidcofactorsres64PRP
2018-06-30T12:14:49Oliver KruseGTX-0
30902416648779599761
DC491582F79170__no
2019-12-20T11:28:57ATHec2-PRPCFDC
30902416648779599761
DC491582F79170DEno


P-1 factor-bounds graph:
B1 = 100000, B2 = 1950000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 40000 (P-1 stage 1)
102
103
104
105
102
103
104
105
106
107
108
TF factor-bounds graph:
267
263
262
250
260
270
280
290
2100
Last modified: 2019-12-20T11:28:57+00:00