is 2 2619997 - 1
has 788698 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-L9962B918FFCE5F2Ddouble-checked
PRP77D1B0D5AC3DE96Dverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26822.750067.6471%2619997261999700.43736.2137%23.187369.6574%2.0103%
PrimeNet2590.029362.7119%110002000000.00242.6987%0.031763.7182%1.0063%
GPU722630.609265.0794%120002000000.00251.5327%0.611765.6146%0.5352%
Difference+5+22.1408+2.5677%+2607997+25999970+0.4348+4.6811%+22.5756+4.0428%+4.0428%

Known prime factors (1 factor, 76.3 bits, 0.00291126% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2619997914209292121146219138392376.27517446762193261027
11 × 30313 × 52323072289
2020-08-10303135232307228910,528319.26596.28

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%
2010-11-17T22:12:00Jocelyn LaroucheManual testing2000020000---0.002--0.266%
2010-12-12T04:02:00markrtiny1000002125000---0.024--2.474%
2014-10-13T22:29:00Jocelyn LaroucheManual testing124498124498---0.014--0.942%
2016-05-26T05:21:40Jocelyn LaroucheManual testing20000036000006---0.043--3.156%
2017-07-20T22:03:19Jocelyn Larouchelow 4M40000040000006---0.067--3.547%
2019-10-14T15:57:36masserManual testing26199972619997012---0.437--6.214%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.029--
2016-02-23T16:29:17Mark RoseManual testing259260--0.029--
2009-01-31T07:37:00Sturle Sundegiovanni.ifi260261--0.059--
2012-06-18T11:35:00Grant McCrackenthumper261262--0.117--
2013-01-14T11:57:00dbaughManual testing262263--0.375--
2015-02-18T11:41:00VictordeHollanderManual testing263264--0.749--
2015-02-18T11:41:00VictordeHollanderManual testing264265--1.426--
2016-01-17T23:07:15ramgeisManual testing265266--2.852--
2017-08-30T11:24:06Gordon SpenceManual testing266267--5.704--
2019-04-15T13:43:00TJAOIManual testing267268--11.41--


ECM factoring results:

Old Calculation Method

Total ECM effort:5.155 GHz-days
Estimated T-Level:2.500
DigitsB1CurvesCompleteFacMiss
201100050 / 1000.50060.501%
255000050 / 2800.17983.620%

New Calculation Method

Total ECM effort:5.155 GHz-days
Estimated T-Level:2.500
DigitsB1CompleteFacMiss
20110001.61319.931%
25500000.14686.435%
302500000.00999.106%


ECM Summary

B1B2factorcurvesGHz-days
500005000000484.949
50000500000020.206


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-30T00:00:00ANONYMOUSv4_computers9962B918FFCE5F2D0.202
2000-02-09T00:00:00ANONYMOUSv4_computers9962B918FFCE5F2D0.202
2018-07-07T12:14:05kkmrkkblmbrbkold9962B918FFCE5F2D0.202


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-11T01:06:43CrypticCluecruncher
91420929212114621913839
77D1B0D5AC3DE96Dno


P-1 factor-bounds graph:
B1 = 2619997, B2 = 26199970 (P-1 stage 2)
B1 = 2619997 (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 = 124498 (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: 2020-08-11T01:06:43+00:00