is 2 1686973 - 1
has 507830 decimal digits
takes 0.079 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L98CFC05D623C9ECAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.613768.6567%500000150000000.08805.0191%17.701870.2299%1.5731%
PrimeNet2570.011463.1579%80001300000.00102.7273%0.012464.1627%1.0048%
GPU722610.182165.5738%7000900000.00081.2565%0.182966.0063%0.4326%
Difference+6+17.4317+3.0829%+493000+14910000+0.0872+3.7626%+17.5189+4.2235%+4.2235%

Known prime factors (1 factor, 69.6 bits, 0.00412299% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16869738664490460263287180892169.554256805842780628
22 × 93493 × 686698049
2008-06-1393493686698049109.552.55914.7685

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:18:44alpertronManual testing5000001500000012---0.088--5.019%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-03-16T00:00:00ANONYMOUSv4_computers21258--0.023--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.383 GHz-days
Estimated T-Level:24.625
DigitsB1CurvesCompleteFacMiss
2011000259 / 1002.5907.405%
2550000259 / 2800.92539.588%

New Calculation Method

Total ECM effort:15.383 GHz-days
Estimated T-Level:24.625
DigitsB1CompleteFacMiss
20110009.9620.005%
25500000.92239.784%
302500000.05894.352%
3510000000.00399.729%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025915.38


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00ANONYMOUSv4_computers98CFC05D623C9ECA0.079


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T01:12:52Oliver KruseGTX-3
866449046026328718089
D6A99ED4174FCA__no
2017-11-03T08:19:47ATHec2-1xf
866449046026328718089
D6A99ED4174FCA__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
267
258
257
250
260
270
280
290
2100
Last modified: 2020-02-10T17:34:46+00:00