is 2 2418511 - 1
has 728045 decimal digits
takes 0.163 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCFAD541B0A13C157double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.286067.1642%2000000600000000.50557.6213%12.791569.6667%2.5025%
PrimeNet2590.031862.7119%100001800000.00192.5221%0.033663.6523%0.9405%
GPU722630.659965.0794%100001400000.00171.2769%0.661665.5253%0.4459%
Difference+4+11.6261+2.0848%+1990000+59860000+0.5038+6.3444%+12.1299+4.1414%+4.1414%

Known prime factors (1 factor, 94.6 bits, 0.00391037% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2418511294613605467789396068132384332994.5736090805571440224916656
24 × 32 × 443 × 95479144272639593
2017-04-11443954791442726395932.706e+9509,561,584951,719,136

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.288%
2010-11-09T22:13:00Jocelyn LaroucheManual testing1500015000---0.001--0.244%
2010-11-16T23:09:00Jocelyn LaroucheManual testing2000020000---0.002--0.312%
2010-12-18T23:28:00markrtiny950001923750---0.019--2.661%
2014-04-04T05:36:00mikrMSI310282243439508---0.519--7.442%
2018-09-28T16:26:26alpertronManual testing20000006000000012---0.505--7.621%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-02-12T00:00:00ANONYMOUSv4_computers21258--0.016--
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.032--
2016-02-23T16:29:14Mark RoseManual testing259260--0.032--
2009-01-11T15:57:00Sturle Sundeothello.ifi260261--0.064--
2012-06-04T14:43:00Sebastian HornbostelManual testing261262--0.127--
2013-12-04T21:14:00Jerry HallettManual testing262263--0.406--
2015-02-27T20:40:00VictordeHollanderManual testing263264--0.812--
2015-02-27T20:40:00VictordeHollanderManual testing264265--1.545--
2015-10-22T10:17:20ramgeisManual testing265266--3.090--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.406 GHz-days
Estimated T-Level:1.350
DigitsB1CurvesCompleteFacMiss
201100027 / 1000.27076.234%
255000027 / 2800.09690.792%

New Calculation Method

Total ECM effort:2.406 GHz-days
Estimated T-Level:1.350
DigitsB1CompleteFacMiss
20110000.87141.855%
25500000.07992.430%
302500000.00599.516%


ECM Summary

B1B2factorcurvesGHz-days
500005000000242.139
50000500000030.267


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-12T00:00:00ANONYMOUSv4_computersCFAD541B0A13C1570.163
1999-03-26T00:00:00ANONYMOUSv4_computersCFAD541B0A13C1570.163


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-13T14:48:04Oliver KruseGTX-07CED9F0A078568__no
2017-11-27T01:42:56kkmrkkblmbrbkc4.xlarge
29461360546778939606813238433
7CED9F0A078568__no


P-1 factor-bounds graph:
B1 = 3102822, B2 = 43439508 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 3102822 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 95000, B2 = 1923750 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
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: 2018-09-28T16:26:26+00:00