is 2 2460187 - 1
has 740591 decimal digits
takes 0.171 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDF543E483085D092double-checked
PRPB28EC8F90C92030Bverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26948.527568.1159%2382500857701000.69656.9371%49.224170.3278%2.2118%
PrimeNet2590.031262.7119%100001800000.00192.5302%0.033263.6553%0.9435%
GPU722630.648765.0794%100001600000.00181.3345%0.650665.5454%0.4660%
Difference+6+47.8788+3.0366%+2372500+85610100+0.6947+5.6026%+48.5735+4.7824%+4.7824%

Known prime factors (1 factor, 80.6 bits, 0.00327537% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
246018718076002634055845051853272580.580367370501389850549
79 × 379 × 30307 × 404850827
2021-08-1930307404850827168,6652.22134.1433

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.188%
2003-10-31T00:00:00Team Prime Ribv4_computers15000232500---0.003--0.673%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.220%
2011-01-20T06:39:00Oscar Östlin950001947500---0.020--2.104%
2014-09-02T00:10:00Jocelyn LaroucheManual testing121089121089---0.012--0.797%
2014-10-09T05:55:00mikrMSI238250085770100---0.697--6.937%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:14Mark RoseManual testing259260--0.031--
2009-01-12T19:58:00Sturle Sundecorbusier.ifi260261--0.062--
2012-06-07T21:42:00Sebastian HornbostelManual testing261262--0.125--
2013-12-04T21:13:00Jerry HallettManual testing262263--0.399--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.798--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.519--
2015-10-26T11:51:00ramgeisManual testing265266--3.037--
2017-07-15T13:17:46Gordon SpenceManual testing266267--6.075--
2019-07-01T11:11:01TJAOIManual testing267268--12.15--
2021-07-26T11:06:22TJAOIManual testing268269--24.30--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.402 GHz-days
Estimated T-Level:22.607
DigitsB1CurvesCompleteFacMiss
2011000146 / 1001.46023.054%
2550000146 / 2800.52159.312%

New Calculation Method

Total ECM effort:13.402 GHz-days
Estimated T-Level:22.607
DigitsB1CompleteFacMiss
20110004.7170.894%
25500000.42665.326%
302500000.02697.412%
3510000000.00199.880%


ECM Summary

B1B2factorcurvesGHz-days
50000500000013212.11
50000500000070.642
50000520000070.653


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computersDF543E483085D0920.171
2018-05-26T18:42:02kkmrkkblmbrbkoldDF543E483085D0920.171


PRP results:
dateuseridcompidcofactorsres64PRP
2021-08-19T20:02:41SRJ2877LTOS
1807600263405584505185327
B28EC8F90C92030Bno


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 121089 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 232500 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-08-19T20:02:41+00:00