is 2 56921869 - 1
has 17135190 decimal digits
takes 120.643 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
Actual27216.800863.8889%----16.800863.8889%
Target27333.604764.3836%40000010400000018.57574.0677%52.180465.8323%
Difference-1-16.8039-0.4947%-400000-104000000-18.5757-4.0677%-35.3796-1.9435%

Known prime factors (1 factor, 67.9 bits, 0.00011934% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
569218692809136224895224272472167.9292467536883667
17 × 99277 × 1462063		2012-07-269927714620630.82060.53330.6209

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-07-26PPed72Unimib2167.929-241.3-0.000%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-12-23ANONYMOUSv4_computers21253--2.10802e-5--
2000-01-19ANONYMOUSv4_computers21253--2.10802e-5--
2000-03-08ANONYMOUSv4_computers21254--4.21604e-5--
2000-06-28ANONYMOUSv4_computers21256--0.000--
2000-06-29ANONYMOUSv4_computers21256--0.000--
2001-09-30ANONYMOUSv4_computers21257--0.000--
2002-11-16ANONYMOUSv4_computers21258--0.001--
2005-01-20ThomRuleyv4_computers21262--0.011--
2022-06-27LordJuliusManual testing262263--0.017--
2008-08-24Sturle Sundebuxtehude.ifi263264--0.034--
2008-08-25Sturle Sundejodel.ifi264265--0.066--
2008-08-25Sturle Sundejodel.ifi265266--0.131--
2008-08-26Sturle Sundejodel.ifi266267--0.263--
2010-03-31sannerud.comJimEmcLap267268--0.525--
2011-04-19Paul LeylandManual testing268269--1.050--
2011-06-12ANONYMOUS269270--2.100--
2011-09-14CreweNetWork270271--4.201--
2012-07-16Sebastian HornbostelManual testing271272--8.402--


ECM factoring results:
No ECM results for M56921869


Lucas-Lehmer results:
No L-L results for M56921869


PRP results:
No PRP results for M56921869


P-1 factor-bounds graph:
103
104
105
103
104
105
106
107
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
262
258
257
256
254
253
this exponent TF target: 73
TF double-checked to: 67.8
250
260
270
280
Last modified: 2023-06-05T21:50:05+00:00