is 2 6916681 - 1
has 2082129 decimal digits
takes 1.508 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L92E76D43012EC80Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2674.296065.6716%----4.296065.6716%
Target2674.296065.6716%450009000000.02902.2361%4.324966.4393%
Difference----45000-900000-0.0290-2.2361%-0.0290-0.7676%

Known prime factors (1 factor, 64.5 bits, 0.00093190% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6916681253156675436752952572064.4571830044463788
22 × 349 × 17351 × 75553
2009-06-1117351755530.67690.00650.0112

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-06-11Roman MaznichenkoWorkShop2064.457-3.016-0.000%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-04ANONYMOUSv4_computers21262--0.089--
2000-02-01Hatchv4_computers21263--0.231--


ECM factoring results:
No ECM results for M6916681


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-03-01ANONYMOUSv4_computers92E76D43012EC80F1.508
2002-02-03ANONYMOUSv4_computers92E76D43012EC80F1.508


PRP results:
dateuseridcompidcofactorsres64PRP
2018-01-24Oliver KruseGTX-7
25315667543675295257
267C26AA8E2933__no
2019-01-23ATHec2-PRPCFDC1
25315667543675295257
267C26AA8E29335Bno


P-1 factor-bounds graph:
103
104
105
103
104
105
TF factor-bounds graph:
263
262
this exponent TF target: 67
TF double-checked to: 67.8
250
260
270
Last modified: 2023-04-26T21:34:10+00:00