is 2 1718593 - 1
has 517349 decimal digits
takes 0.081 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD118CBB16FDC17A0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.289768.6567%500000150000000.08805.0303%17.377770.2334%1.5767%
PrimeNet2570.011263.1579%80001400000.00102.7929%0.012264.1868%1.0290%
GPU722610.178765.5738%70001100000.00091.3434%0.179666.0363%0.4625%
Difference+6+17.1109+3.0829%+493000+14890000+0.0872+3.6869%+17.1981+4.1971%+4.1971%

Known prime factors (1 factor, 62.7 bits, 0.00365057% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
171859376940220987581320091962.7382238465447828
22 × 32 × 43 × 2111 × 685001
2009-09-2421116850010.75660.00270.0048

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:30:53alpertronManual testing5000001500000012-
skipped known factor: 7694022098758132009
--0.088--5.030%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.889 GHz-days
Estimated T-Level:24.768
DigitsB1CurvesCompleteFacMiss
2011000267 / 1002.6706.833%
2550000267 / 2800.95438.471%

New Calculation Method

Total ECM effort:15.889 GHz-days
Estimated T-Level:24.768
DigitsB1CompleteFacMiss
201100010.2690.003%
25500000.95038.667%
302500000.06094.183%
3510000000.00399.720%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000026715.89


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computersD118CBB16FDC17A00.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:15:36alpertronManual testing
7694022098758132009
759689D4F9C746__no
2017-10-19T03:01:43Oliver KruseGTX-0
7694022098758132009
759689D4F9C746__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2020-04-20T10:39:03+00:00