is 2 15491027 - 1
has 4663264 decimal digits
takes 7.769 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1FFD8BC6143ADA56double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671.918164.1791%17500020125000.20013.8600%2.118265.5618%1.3827%
PrimeNet2650.471063.0769%7000022000000.13534.2985%0.606364.6640%1.5871%
GPU722697.706865.2174%11000028000000.18663.1104%7.893466.2993%1.0819%
Difference-2-5.7887-1.0383%+65000-787500+0.0135+0.7495%-5.7752-0.7375%-0.7375%

Known prime factors (1 factor, 75.0 bits, 0.00048437% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15491027386588098259648668491912375.0331247780725769985
3 × 5 × 11 × 7562307428909
2016-12-18117562307428909652.73299,624559,614

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-05-05T00:00:00dakrugerv4_computers1750002012500---0.200--3.860%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-01-14T00:00:00Net_Forcev4_computers21258--0.002--
2001-03-25T00:00:00ANONYMOUSv4_computers21265--0.471--
2014-02-23T00:23:00NesowaManual testing265266--0.482--
2014-02-23T00:23:00NesowaManual testing266267--0.965--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.763 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.763 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03296.826%
25500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.763


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-05-25T00:00:00Architects Cubedv4_computers1FFD8BC6143ADA567.769
2005-11-27T00:00:00ANONYMOUSv4_computers1FFD8BC6143ADA567.769


PRP results:
No PRP results for M15491027


P-1 factor-bounds graph:
B1 = 175000, B2 = 2012500 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2016-12-19T02:29:04+00:00