is 2 7291519 - 1
has 2194966 decimal digits
takes 1.590 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6A21FEA8E215979Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2674.075165.6716%9000016200000.05482.9869%4.129966.6970%1.0254%
PrimeNet2630.218963.4921%320008000000.02333.3798%0.242264.7260%1.2339%
GPU722674.075165.6716%4500010000000.03072.3153%4.105866.4664%0.7948%
Difference---+45000+620000+0.0241+0.6716%+0.0241+0.2306%+0.2306%

Known prime factors (1 factor, 74.0 bits, 0.00101460% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
7291519186280353980378359733932373.9801277376867428984
23 × 72 × 539309 × 6042203
2017-12-145393096042203394.310.26530.3470

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-13T04:42:00Carsten Kossendeyleela40000610000---0.022--1.986%
2012-08-31T05:17:00Squeeky_SquirrelP4_2600900001620000---0.055--2.987%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-04T00:00:00ANONYMOUSv4_computers21263--0.219--
2013-11-03T11:16:00NesowaManual testing263264--0.269--
2013-11-19T22:34:00David CampeauManual testing264265--0.512--
2015-06-16T01:50:00VictordeHollanderManual testing265266--1.025--
2016-10-19T17:39:58Gordon SpenceManual testing266267--2.050--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.658 GHz-days
Estimated T-Level:0.250
DigitsB1CurvesCompleteFacMiss
20110005 / 1000.05095.099%
25500005 / 2800.01898.227%

New Calculation Method

Total ECM effort:1.658 GHz-days
Estimated T-Level:0.250
DigitsB1CompleteFacMiss
20110000.16185.104%
25500000.01598.553%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.995
50000500000020.663


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-05-05T00:00:00ANONYMOUSv4_computers6A21FEA8E215979A1.590
2002-02-17T00:00:00ANONYMOUSv4_computers6A21FEA8E215979A1.590


PRP results:
dateuseridcompidcofactorsres64PRP
2018-02-26T14:24:26Oliver KruseGTX-0
18628035398037835973393
1318FABDE2DBFF__no
2019-04-29T11:41:40kkmrkkblmbrbkc5.large
18628035398037835973393
1318FABDE2DBFF86no


P-1 factor-bounds graph:
B1 = 90000, B2 = 1620000 (P-1 stage 2)
B1 = 90000 (P-1 stage 1)
B1 = 40000, B2 = 610000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
TF factor-bounds graph:
267
266
265
264
263
250
260
270
280
290
2100
Last modified: 2019-04-29T11:41:40+00:00