is 2 1714759 - 1
has 516194 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-L021F8E5E871D0D19double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.328368.6567%500000150000000.08805.0290%17.416470.2330%1.5762%
PrimeNet2570.011263.1579%80001400000.00102.7917%0.012264.1864%1.0285%
GPU722610.179165.5738%70001100000.00091.3428%0.180066.0360%0.4623%
Difference+6+17.1492+3.0829%+493000+14890000+0.0872+3.6862%+17.2364+4.1969%+4.1969%

Known prime factors (1 factor, 67.7 bits, 0.00394773% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17147592387465476617934145112167.69469615190140945
3 × 5 × 269 × 1511 × 11418157
2014-01-1615111141815721.3470.04250.0793

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-29T18:46:00Jocelyn LaroucheManual testing5000050000---0.003--0.572%
2011-02-09T06:20:00Carsten Kossendeyleela900001507500---0.011--2.355%
2016-03-16T12:30:33alpertronManual testing5000001500000012-
skipped known factor: 238746547661793414511
--0.088--5.029%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-24T12:42:00Architects Cubeda3_bu2260261--0.090--
2010-10-16T22:16:00GrunwalderGIMPManual testing21263--0.931--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.112 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:15.112 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110008.1940.028%
25500000.74147.686%
302500000.04695.542%
3510000000.00299.791%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025415.11


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computers021F8E5E871D0D190.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:15:29alpertronManual testing
238746547661793414511
3F3F27DAFEA4F5__no
2017-10-19T00:03:00Oliver KruseThreadripper
238746547661793414511
3F3F27DAFEA4F5__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 90000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2020-04-06T09:20:50+00:00