is 2 1598873 - 1
has 481309 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-L1A8290DA9FB31D8Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.584368.6567%500000150000000.08354.9867%18.667870.2197%1.5630%
PrimeNet2570.012063.1579%70001200000.00092.5478%0.012964.0965%0.9386%
GPU722610.192165.5738%6500600000.00061.0562%0.192765.9374%0.3636%
Difference+6+18.3922+3.0829%+493500+14940000+0.0829+3.9305%+18.4751+4.2823%+4.2823%

Known prime factors (1 factor, 66.7 bits, 0.00416904% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15988731164046506990896573512166.65836402094068475
52 × 1456083762739
2010-03-2825145608376273912.6265,138.09,596.4

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:29:00alpertronManual testing5000001500000012---0.084--4.987%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-06T00:00:00chris luedersv4_computers21257--0.012--
2003-07-30T00:00:00ANONYMOUSv4_computers21258--0.024--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.015 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:14.015 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110009.6150.007%
25500000.89041.079%
302500000.05694.543%
3510000000.00399.738%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025014.02


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers1A8290DA9FB31D8D0.071


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T03:11:40Oliver KruseGTX-1
116404650699089657351
DBE7D4AFE7995E__no
2017-10-31T23:18:12kkmrkkblmbrbkc4.xlarge
116404650699089657351
DBE7D4AFE7995E__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-09-30T12:54:41+00:00