is 2 1697287 - 1
has 510935 decimal digits
takes 0.080 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.506768.6567%500000150000000.08805.0228%17.594770.2310%1.5743%
PrimeNet2570.011363.1579%80001300000.00102.7305%0.012364.1639%1.0060%
GPU722610.181065.5738%70001000000.00081.3009%0.181866.0216%0.4478%
Difference+6+17.3257+3.0829%+493000+14900000+0.0872+3.7219%+17.4129+4.2094%+4.2094%

Known prime factors (3 factors, 163.6 bits, 0.00964108% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
169728727156593824.6958
23
-881.319e-125.459e-71.111e-6
16972876943280206034010941292169.234204540546355272
23 × 34 × 10253 × 30786013
2018-07-241025330786013101.630.11510.2138
16972879641330997012188234332169.708284021824152668
22 × 7 × 662443 × 15312467
2018-03-0566244315312467100.650.09970.1063

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1697287188555834640221779290159424972993.929
1697287261825701864144211919088437692994.403
169728766942462671376882450666417371432226392485742138.942
16972871817929213184274746321590475324114799224592413220150163.637
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:18:52alpertronManual testing5000001500000012-
skipped known factor: 27156593
--0.088--5.023%


Trial Factoring results:
No TF results for M1697287


ECM factoring results:

Old Calculation Method

Total ECM effort:15.630 GHz-days
Estimated T-Level:24.696
DigitsB1CurvesCompleteFacMiss
2011000263 / 1002.6307.113%
2550000263 / 2800.93939.025%

New Calculation Method

Total ECM effort:15.630 GHz-days
Estimated T-Level:24.696
DigitsB1CompleteFacMiss
20110008.4840.021%
25500000.76746.451%
302500000.04795.388%
3510000000.00299.784%


ECM Summary

B1B2factorcurvesGHz-days
50000500000026115.51
50000500000010.059
50000500000010.059


Lucas-Lehmer results:
No L-L results for M1697287


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:16:36alpertronManual testing
27156593
49FBB42A23E271__no
2017-10-18T16:08:11Oliver KruseThreadripper
27156593
49FBB42A23E271__no
2018-03-09T15:57:32treborDesktop
27156593
964133099701218823433
55782DB40B211F__no
2018-03-10T02:04:57ANONYMOUSdory
27156593
964133099701218823433
55782DB40B211F__no
2018-03-11T06:10:16Chang Chia-Tcheexbpc13
27156593
964133099701218823433
55782DB40B211F__no
2018-07-24T11:22:31_p95holder_b_PRPt11_TFL7
27156593
694328020603401094129
964133099701218823433
55782DB40B211F__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2020-02-24T10:24:30+00:00