is 2 2616791 - 1
has 787733 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-L7C75CC35110DC0ABdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26945.623468.1159%2616791261679100.43685.6934%46.060169.9312%1.8153%
PrimeNet2590.029362.7119%110002000000.00242.6981%0.031763.7179%1.0061%
GPU722630.609965.0794%120002000000.00251.5323%0.612465.6145%0.5351%
Difference+6+45.0134+3.0366%+2604791+25967910+0.4343+4.1611%+45.4477+4.3168%+1.2802%

Known prime factors:
No known factors for M2616791

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.192%
2003-11-08T00:00:00Team Prime Ribv4_computers15000217500---0.003--0.667%
2010-11-17T22:11:00Jocelyn LaroucheManual testing2000020000---0.002--0.223%
2010-12-13T00:41:00markrtiny1000002125000---0.024--2.194%
2014-10-12T23:56:00Jocelyn LaroucheManual testing124528124528---0.014--0.819%
2016-05-24T01:15:56Jocelyn LaroucheManual testing20000036000006---0.043--2.826%
2017-07-20T22:03:19Jocelyn Larouchelow 4M40000040000006---0.067--3.195%
2019-10-14T15:57:27masserManual testing26167912616791012---0.437--5.693%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00mijutuv4_computers21259--0.029--
2016-02-23T16:29:17Mark RoseManual testing259260--0.029--
2009-01-31T23:04:00Sturle Sundegonsha.ifi260261--0.059--
2012-06-21T23:23:00markroldgamer261262--0.117--
2013-01-14T11:57:00dbaughManual testing262263--0.375--
2015-02-18T11:41:00VictordeHollanderManual testing263264--0.750--
2015-02-18T11:41:00VictordeHollanderManual testing264265--1.428--
2016-01-17T23:07:14ramgeisManual testing265266--2.856--
2017-08-30T11:24:05Gordon SpenceManual testing266267--5.711--
2019-04-22T13:11:29TJAOIManual testing267268--11.42--
2021-05-27T10:38:23TJAOIManual testing268269--22.85--


ECM factoring results:
Total ECM effort:16.374 GHz-days
Estimated T-Level:22.812
DigitsB1CompleteFacMiss
20110006.0310.240%
25500000.56256.988%
302500000.03696.479%
3510000000.00299.831%


ECM Summary

B1B2factorcurvesGHz-days
50000500000014214.64
50000700000070.845
766201000000050.892


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-02T00:00:00mijutuv4_computers7C75CC35110DC0AB0.202
2018-07-07T01:16:57kkmrkkblmbrbkold7C75CC35110DC0AB0.202


PRP results:
No PRP results for M2616791


P-1 factor-bounds graph:
B1 = 2616791, B2 = 26167910 (P-1 stage 2)
B1 = 2616791 (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 = 124528 (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: 2022-09-23T18:56:43+00:00