is 2 2614849 - 1
has 787148 decimal digits
takes 0.202 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7DFC25E44EA4FFD8double-checked
PRP4EA21EFDB0272F00verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26822.794867.6471%2614849261484900.43646.2093%23.231269.6559%2.0089%
PrimeNet2590.029462.7119%110002000000.00242.6977%0.031863.7178%1.0059%
GPU722630.610465.0794%120002000000.00251.5321%0.612965.6144%0.5350%
Difference+5+22.1844+2.5677%+2602849+25948490+0.4339+4.6772%+22.6183+4.0416%+4.0416%

Known prime factors (1 factor, 75.8 bits, 0.00289718% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2614849638437367284885379167372375.75712207920367196832
25 × 381497511474901
2020-11-25323814975114749015,150.92,327,7654,347,617

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.238%
2003-11-08T00:00:00Team Prime Ribv4_computers15000217500---0.003--0.782%
2010-11-17T11:35:00Jocelyn LaroucheManual testing2000020000---0.002--0.266%
2010-12-13T13:51:00markrtiny1000002125000---0.024--2.473%
2014-10-12T23:56:00Jocelyn LaroucheManual testing124546124546---0.014--0.942%
2016-05-24T01:15:55Jocelyn LaroucheManual testing20000036000006---0.043--3.155%
2017-07-20T22:03:18Jocelyn Larouchelow 4M40000040000006---0.067--3.546%
2019-10-06T14:23:36masserManual testing26148492614849012---0.436--6.209%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00Dry Creek Photov4_computers21259--0.029--
2016-02-23T16:29:17Mark RoseManual testing259260--0.029--
2009-01-31T21:53:00Sturle Sundegilia.ifi260261--0.059--
2012-06-24T02:37:00markroldgamer261262--0.117--
2013-01-14T11:55:00dbaughManual testing262263--0.375--
2015-02-18T11:41:00VictordeHollanderManual testing263264--0.751--
2015-02-18T11:41:00VictordeHollanderManual testing264265--1.429--
2016-01-17T23:07:13ramgeisManual testing265266--2.858--
2017-08-30T11:24:04Gordon SpenceManual testing266267--5.716--
2019-04-22T13:11:30TJAOIManual testing267268--11.43--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.932 GHz-days
Estimated T-Level:4.150
DigitsB1CurvesCompleteFacMiss
201100083 / 1000.83043.423%
255000083 / 2800.29674.307%

New Calculation Method

Total ECM effort:8.932 GHz-days
Estimated T-Level:4.150
DigitsB1CompleteFacMiss
20110002.7546.366%
25500000.25277.722%
302500000.01698.431%


ECM Summary

B1B2factorcurvesGHz-days
500005000000727.421
50000500000060.618
766201000000050.892


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00Dry Creek Photov4_computers7DFC25E44EA4FFD80.202
2018-07-01T07:38:25kkmrkkblmbrbkold7DFC25E44EA4FFD80.202


PRP results:
dateuseridcompidcofactorsres64PRP
2020-11-25T15:12:25ee33t1hp8300
63843736728488537916737
4EA21EFDB0272F00no


P-1 factor-bounds graph:
B1 = 2614849, B2 = 26148490 (P-1 stage 2)
B1 = 2614849 (P-1 stage 1)
B1 = 400000, B2 = 4000000 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
B1 = 200000, B2 = 3600000 (P-1 stage 2)
B1 = 100000, B2 = 2125000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 124546 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (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: 2020-12-13T10:41:42+00:00