is 2 15908359 - 1
has 4788894 decimal digits
takes 8.699 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1E32F06C21D6959Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2683.746864.7059%2350002350000.18631.7702%3.933165.3307%0.6248%
PrimeNet2650.458663.0769%7000022000000.14754.3148%0.606164.6701%1.5932%
GPU722697.504765.2174%11000028000000.20343.1224%7.708166.3035%1.0861%
Difference-1-3.7579-0.5115%+125000-2565000-0.0171-1.3523%-3.7750-0.9728%-0.9728%

Known prime factors (1 factor, 67.0 bits, 0.00042111% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
159083591467027684671254151772166.9914610870563932
22 × 32 × 128079737887
2014-07-2991280797378871.47985,532.710,334

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-12-25T00:00:00ANONYMOUSv4_computers235000235000---0.186--1.770%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-01-28T00:00:00Net_Forcev4_computers21258--0.002--
2001-03-18T00:00:00Net_Forcev4_computers21259--0.005--
2022-08-10T19:28:56LordJuliusManual testing21264--0.224--
2001-05-06T00:00:00ANONYMOUSv4_computers21265--0.459--
2022-08-10T19:28:56LordJuliusManual testing264265--0.235--
2022-08-10T19:28:56LordJuliusManual testing265266--0.470--
2014-07-29T23:11:00NesowaManual testing26626766.991210.55117.701.122
2022-08-10T19:28:56LordJuliusManual testing26626766.991210.55117.701.122
2022-08-10T19:28:56LordJuliusManual testing267268--1.879--


ECM factoring results:
No ECM results for M15908359


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-01-25T00:00:00ANONYMOUSv4_computers1E32F06C21D6959F8.699
2006-06-13T00:00:00TheJudgerv4_computers1E32F06C21D6959F8.699


PRP results:
No PRP results for M15908359


P-1 factor-bounds graph:
B1 = 235000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-08-10T19:28:56+00:00