is 2 2819491 - 1
has 848752 decimal digits
takes 0.218 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7F84301A2CC582C2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27084.749668.5714%50000002000000001.74987.8484%86.499371.0381%2.4666%
PrimeNet2590.027262.7119%120002400000.00272.9308%0.030063.8047%1.0928%
GPU722630.566165.0794%150002600000.00321.7921%0.569265.7052%0.6258%
Difference+7+84.1835+3.4921%+4985000+199740000+1.7466+6.0563%+85.9301+5.3329%+5.3329%

Known prime factors:
No known factors for M2819491

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-28T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.158%
2016-09-11T16:07:10Jocelyn Larouchelow 4M16000033000006---0.037--2.404%
2016-12-19T18:37:54Jocelyn Larouchelow 4M192000192000---0.022--0.925%
2017-01-10T10:25:16Jocelyn Larouchelow 4M230400230400---0.026--1.020%
2017-04-04T20:17:34Jocelyn Larouchelow 4M33177633177606---0.055--2.707%
2018-09-03T21:22:22Jocelyn Larouchelow 4M506131506131---0.057--1.502%
2018-09-05T22:38:03Jocelyn Larouchelow 4M607357607357---0.068--1.629%
2018-09-12T23:00:20Jocelyn Larouchelow 4M66355213271044---0.078--2.217%
2019-05-22T10:32:22BigBrotherWinston10000001000000012---0.167--3.970%
2019-11-10T16:24:59masserManual testing30000003000000012---0.501--5.454%
2020-01-19T15:04:42masserManual testing500000020000000012---1.750--7.848%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:22Mark RoseManual testing21260--0.054--
2009-02-13T20:05:00Sturle Sundefizir.ifi260261--0.054--
2012-02-24T07:39:00Grant McCrackenthumper261262--0.109--
2013-01-10T10:21:00dbaughManual testing262263--0.348--
2015-04-21T09:19:00VictordeHollanderManual testing263264--0.696--
2015-04-21T09:19:00VictordeHollanderManual testing264265--1.325--
2016-02-12T10:12:11ramgeisManual testing265266--2.650--
2017-10-28T16:39:37Gordon SpenceManual testing266267--5.301--
2017-11-06T09:42:44mikrManual testing267268--10.60--
2018-05-15T16:09:47YxinityManual testing268269--21.20--
2018-05-15T16:09:47YxinityManual testing269270--42.41--


ECM factoring results:

Old Calculation Method

Total ECM effort:12.712 GHz-days
Estimated T-Level:22.161
DigitsB1CurvesCompleteFacMiss
2011000121 / 1001.21029.639%
2550000121 / 2800.43264.861%

New Calculation Method

Total ECM effort:12.712 GHz-days
Estimated T-Level:22.161
DigitsB1CompleteFacMiss
20110004.6760.931%
25500000.43264.901%
302500000.02797.309%
3510000000.00199.873%


ECM Summary

B1B2factorcurvesGHz-days
50000500000011411.89
50000645000070.822


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-30T00:00:00ANONYMOUSv4_computers7F84301A2CC582C20.218
2018-09-06T18:00:30kkmrkkblmbrbkold7F84301A2CC582C20.218


PRP results:
No PRP results for M2819491


P-1 factor-bounds graph:
B1 = 5000000, B2 = 200000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 3000000, B2 = 30000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 1000000, B2 = 10000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 663552, B2 = 1327104 (P-1 stage 2)
B1 = 663552 (P-1 stage 1)
B1 = 607357 (P-1 stage 1)
B1 = 506131 (P-1 stage 1)
B1 = 331776, B2 = 3317760 (P-1 stage 2)
B1 = 331776 (P-1 stage 1)
B1 = 160000, B2 = 3300000 (P-1 stage 2)
B1 = 230400 (P-1 stage 1)
B1 = 192000 (P-1 stage 1)
B1 = 160000 (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: 2022-06-05T07:18:20+00:00