is 2 6351781 - 1
has 1912077 decimal digits
takes 1.126 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2674.678065.6716%1090001905075902.69376.8725%7.371768.0309%
Target2662.325165.1515%4500050000000.08092.5695%2.406066.0469%
Difference+1+2.3530+0.5201%+64000+185507590+2.6128+4.3030%+4.9657+1.9839%

Known prime factors (1 factor, 58.1 bits, 0.00091477% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
63517813098772579193274811858.10424392942540
22 × 5 × 1219647127		1998-06-28512196471270.010217.07631.893

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2023-11-10Stef42z8g4109000190507590---2.694--6.872%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-06-28ANONYMOUSv4_computers??58.104180.0044.5890.017
1998-09-06ANONYMOUSv4_computers??58.104180.0044.5890.017


ECM factoring results:
No ECM results for M6351781


Lucas-Lehmer results:
No L-L results for M6351781


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-29kkmrkkblmbrbkc4.xlarge
309877257919327481
F9345081E27766__no
2018-09-27ANONYMOUS
309877257919327481
F9345081E27766__no


P-1 factor-bounds graph:
B1 = 109000, B2 = 190507590 (P-1 stage 2)
B1 = 109000 (P-1 stage 1)
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101
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109
1010
TF factor-bounds graph:
2
this exponent TF target: 66
TF double-checked to: 67.9
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Last modified: 2023-11-10T03:54:07+00:00