is 2 1711687 - 1
has 515270 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-L32E4ECD300B97F43double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual270139.599570.0000%500000150000000.08803.7429%139.687571.1229%1.1229%
PrimeNet2570.011263.1579%80001400000.00102.7907%0.012364.1861%1.0282%
GPU722610.179565.5738%70001000000.00081.3032%0.180366.0224%0.4486%
Difference+9+139.4200+4.4262%+493000+14900000+0.0872+2.4396%+139.5072+5.1004%+0.6742%

Known prime factors (1 factor, 68.5 bits, 0.00400096% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17116874127889675342218850172168.484120579570778484
22 × 157 × 192005685953
2014-02-2215719200568595351.484713.871,333.3

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:35:00Carsten Kossendeyleela900001507500---0.011--1.624%
2016-03-16T12:30:19alpertronManual testing5000001500000012---0.088--3.743%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-22T12:40:00Architects Cubeda3_bu2260261--0.090--
2010-10-16T22:16:00GrunwalderGIMPManual testing21263--0.932--
2011-09-30T05:31:00Sebastian HornbostelManual testing263264--1.147--
2011-09-30T05:31:00Sebastian HornbostelManual testing264265--2.183--
2014-01-18T11:22:00Never Odd Or EvenManual testing265266--4.366--
2014-01-18T11:22:00Never Odd Or EvenManual testing266267--8.731--
2014-01-18T11:22:00Never Odd Or EvenManual testing267268--17.46--
2014-01-18T11:22:00Never Odd Or EvenManual testing268269--34.93--
2014-02-22T18:36:00Never Odd Or EvenManual testing26826968.4842116.660.16433.87
2014-01-18T11:22:00Never Odd Or EvenManual testing269270--69.85--


ECM factoring results:
Total ECM effort:15.287 GHz-days
Estimated T-Level:24.573
DigitsB1CompleteFacMiss
20110009.8850.005%
25500000.91540.068%
302500000.05894.394%
3510000000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025715.29


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers32E4ECD300B97F430.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:15:22alpertronManual testing
412788967534221885017
AA7C6AAD722DB4__no
2017-10-18T22:48:11Oliver KruseGTX-1
412788967534221885017
AA7C6AAD722DB4__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)
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TF factor-bounds graph:
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Last modified: 2020-04-06T09:20:06+00:00