is 2 52138049 - 1
has 15695117 decimal digits
takes 99.883 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LE31EB29DD4EA6245double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27218.342363.8889%6150006150001.70842.0051%20.050764.6129%
Target27336.688164.3836%3400008800000014.21123.8065%50.899365.7393%
Difference-1-18.3457-0.4947%+275000-87385000-12.5029-1.8014%-30.8486-1.1264%

Known prime factors (1 factor, 68.9 bits, 0.00013207% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
521380495359747058864131996872168.8615139957441507
3 × 72 × 223 × 156796847		2015-01-212231567968472.013623.73144.321

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-12-15curtiscwde2610-36l615000615000---1.708--2.005%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-01-04ANONYMOUSv4_computers21253--2.30143e-5--
2000-02-23ANONYMOUSv4_computers21254--4.60287e-5--
2000-05-05ANONYMOUSv4_computers21256--0.000--
2001-06-09ANONYMOUSv4_computers21257--0.000--
2002-04-07ANONYMOUSv4_computers21258--0.001--
2003-11-161997rj7v4_computers21259--0.001--
2004-02-071997rj7v4_computers21260--0.003--
2006-11-28ANONYMOUSv4_computers21263--0.031--
2008-10-23DerekManual testing21264--0.068--
2009-02-06AbadSkyNet264265--0.072--
2009-03-07heyba_manba2265266--0.143--
2009-03-12EPFEPF_02266267--0.287--
2009-04-19Sturle Sundeheroe.ifi267268--0.573--
2010-03-26sannerud.comJimEmcLap268269--1.147--
2015-01-21Mark RoseManual testing268269*68.861210.870236.72.063
2011-12-01Kyle AskineManual testing269270--2.293--
2011-12-08XyzzyManual testing270271--4.586--
2011-12-08XyzzyManual testing271272--9.173--


ECM factoring results:
No ECM results for M52138049


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2012-01-21curtiscwde2610-36lE31EB29DD4EA624599.9


PRP results:
No PRP results for M52138049


P-1 factor-bounds graph:
B1 = 615000 (P-1 stage 1)
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109
TF factor-bounds graph:
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this exponent TF target: 73
TF double-checked to: 67.8
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Last modified: 2023-06-05T21:50:05+00:00