is 2 2717027 - 1
has 817907 decimal digits
takes 0.210 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBAA9D53B60B5CBD5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.936267.1642%150002175000.00290.9215%10.939167.4668%0.3026%
PrimeNet2590.028362.7119%120002200000.00262.8463%0.030963.7732%1.0613%
GPU722630.587465.0794%140002200000.00281.6633%0.590265.6602%0.5808%
Difference+4+10.3488+2.0848%+1000-2500+0.0001-0.7418%+10.3489+1.8066%+1.8066%

Known prime factors (1 factor, 67.8 bits, 0.00249486% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
27170272544660581147841364072167.78646828032646489
101 × 113 × 1811 × 2265623
2009-03-081811226562313.9100.01400.0258

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.298%
2003-11-28T00:00:00Team Prime Ribv4_computers15000217500---0.003--0.922%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-01-31T13:46:00Sturle Sundedoak.ifi260261--0.057--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-23T00:00:00ANONYMOUSv4_computersBAA9D53B60B5CBD50.210


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-19T20:12:35Oliver KruseGTX-2
254466058114784136407
F766CA63279B24__no
2017-12-04T23:17:32kkmrkkblmbrbkc4.xlarge
254466058114784136407
F766CA63279B24__no


P-1 factor-bounds graph:
B1 = 15000, B2 = 217500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
102
103
104
105
106
107
TF factor-bounds graph:
267
261
250
260
270
280
290
2100
Last modified: 2017-12-04T23:17:32+00:00