is 2 1355989 - 1
has 408194 decimal digits
takes 0.052 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF222978D9F49AD34double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26721.913168.6567%500000150000000.07144.8883%21.984570.1889%1.5321%
PrimeNet2560.007162.5000%60001000000.00062.6153%0.007763.4807%0.9807%
GPU722600.113365.0000%5500400000.00040.9826%0.113765.3439%0.3439%
Difference+7+21.7998+3.6567%+494500+14960000+0.0710+3.9057%+21.8708+4.8450%+4.8450%

Known prime factors (1 factor, 71.8 bits, 0.00529168% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
135598939835328632560535431432271.7551468866216192039
33 × 7 × 47 × 165356998333
2009-08-0347165356998333415.09498.76931.55

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00Team Prime Ribv4_computers15000217500---0.001--0.798%
2016-03-17T19:05:27alpertronManual testing5000001500000012---0.071--4.888%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-03T00:00:00ANONYMOUSv4_computers21257--0.014--
2003-07-06T00:00:00ANONYMOUSv4_computers21258--0.028--
2022-03-07T17:32:36LordJuliusManual testing258260--0.085--
2009-02-15T06:54:00Sturle Sundegooch.ifi260261--0.113--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.082 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000298 / 1002.9805.004%
2550000298 / 2801.06434.432%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.082 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.5380.000%
25500001.64019.395%
302500000.14086.925%
3510000000.01099.024%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024811.61
250000350000005013.48


Lucas-Lehmer results:
No L-L results for M1355989


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T08:14:19Oliver KruseGTX-1
3983532863256053543143
EB765901EEA7BE__no
2017-11-04T18:51:19kkmrkkblmbrbkc4.xlarge
3983532863256053543143
EB765901EEA7BE__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-07T17:32:36+00:00