is 2 5638247 - 1
has 1697282 decimal digits
takes 0.890 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1261842F11C10C80double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.270165.6716%6500011212500.02812.4718%5.298166.5202%0.8485%
PrimeNet2620.109062.9032%240005500000.01213.1743%0.121064.0808%1.1776%
GPU722662.619365.1515%360007000000.01652.1924%2.635965.9155%0.7640%
Difference+1+2.6507+0.5201%+29000+421250+0.0115+0.2794%+2.6623+0.6046%+0.6046%

Known prime factors (1 factor, 80.9 bits, 0.00143507% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
563824722758158758365491377316712580.913201819455216891805
3 × 5 × 17 × 83 × 859 × 11100731363
2015-08-318591110073136386,718138.49258.65

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-08-17T00:00:00ANONYMOUSv4_computers2000020000---0.005--0.378%
2001-01-14T00:00:00FLMv4_computers25000306250---0.009--1.387%
2011-01-25T08:58:00harleeP4_2600650001121250---0.028--2.472%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-09-06T00:00:00ANONYMOUSv4_computers21262--0.109--
2009-04-13T04:26:00GrunwalderGIMPManual testing262263--0.174--
2014-11-16T20:16:00NesowaManual testing263264--0.348--
2014-11-17T00:17:00monstManual testing264265--0.663--
2015-08-27T03:58:00snme2pm1Manual testing265266--1.325--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.720 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.720 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.720


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-18T00:00:00ANONYMOUSv4_computers1261842F11C10C800.890
2001-05-27T00:00:00ANONYMOUSv4_computers1261842F11C10C800.890


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-10T13:18:36treborLaptop
2275815875836549137731671
9F599B572DC71A__no
2018-04-08T03:17:53kkmrkkblmbrbkc5.xlarge
2275815875836549137731671
9F599B572DC71A__no


P-1 factor-bounds graph:
B1 = 65000, B2 = 1121250 (P-1 stage 2)
B1 = 65000 (P-1 stage 1)
B1 = 25000, B2 = 306250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
B1 = 20000 (P-1 stage 1)
101
102
103
104
105
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
266
265
264
263
262
250
260
270
280
290
2100
Last modified: 2018-04-08T03:17:53+00:00