is 2 1584827 - 1
has 477081 decimal digits
takes 0.071 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L210E77E8096C7950double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.749068.6567%500000150000000.08354.9814%18.832570.2180%1.5613%
PrimeNet2570.012163.1579%70001200000.00092.5434%0.013064.0949%0.9370%
GPU722610.193865.5738%6500600000.00061.0541%0.194465.9367%0.3629%
Difference+6+18.5552+3.0829%+493500+14940000+0.0829+3.9273%+18.6381+4.2814%+4.2814%

Known prime factors (1 factor, 66.7 bits, 0.00420807% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15848271190957092540385328172166.69137573725477304
23 × 107 × 19661 × 2232569
2013-04-0919661223256913.1230.00910.0147

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-02T17:11:00James HeinrichWHS850001402500---0.010--2.259%
2016-03-17T19:17:02alpertronManual testing5000001500000012-
skipped known factor: 119095709254038532817
--0.084--4.981%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.024--
2022-03-09T01:21:19LordJuliusManual testing21260--0.097--
2010-05-06T12:30:00Architects Cubeda3_bu2260261--0.097--
2010-06-23T00:16:00GrunwalderGIMPManual testing21263--1.007--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.947 GHz-days
Estimated T-Level:24.446
DigitsB1CurvesCompleteFacMiss
2011000249 / 1002.4908.188%
2550000249 / 2800.88941.030%

New Calculation Method

Total ECM effort:13.947 GHz-days
Estimated T-Level:24.446
DigitsB1CompleteFacMiss
20110008.0320.032%
25500000.72648.387%
302500000.04595.628%
3510000000.00299.796%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024913.95


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-14T00:00:00ANONYMOUSv4_computers210E77E8096C79500.071


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T00:43:28Oliver KruseGTX-2
119095709254038532817
AF09744B0C1A52__no
2017-10-31T16:29:40kkmrkkblmbrbkold
119095709254038532817
AF09744B0C1A52__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 85000, B2 = 1402500 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
267
263
261
260
258
250
260
270
280
290
2100
Last modified: 2022-03-09T01:21:19+00:00