is 2 2892787 - 1
has 870816 decimal digits
takes 0.223 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE57907DCBE170267double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26941.270568.1159%50000002000000001.74988.5070%43.020370.8283%2.7124%
PrimeNet2590.026562.7119%130002400000.00283.0008%0.029463.8308%1.1189%
GPU722630.551765.0794%160003000000.00351.9081%0.555265.7457%0.6663%
Difference+6+40.7188+3.0366%+4984000+199700000+1.7463+6.5989%+42.4650+5.0826%+5.0826%

Known prime factors:
No known factors for M2892787

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-02T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.198%
2016-10-27T15:25:31Jocelyn Larouchelow 4M172800172800---0.019--1.003%
2016-12-14T18:29:39Jocelyn Larouchelow 4M248832248832---0.028--1.214%
2017-02-25T21:08:08Jocelyn Larouchelow 4M29859829859806---0.050--2.908%
2017-10-21T00:17:08Jocelyn Larouchelow 4M59719659719606---0.100--3.718%
2019-10-23T17:07:32masserManual testing29000002900000012---0.484--5.912%
2020-02-11T03:26:38masserManual testing500000020000000012---1.750--8.507%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:24Mark RoseManual testing21260--0.053--
2009-02-13T01:09:00Sturle Sundegehry.ifi260261--0.053--
2012-01-14T11:07:00markroldgamer261262--0.106--
2013-01-10T10:24:00dbaughManual testing262263--0.339--
2015-04-21T09:21:00VictordeHollanderManual testing263264--0.679--
2015-04-21T09:21:00VictordeHollanderManual testing264265--1.292--
2015-11-28T11:39:32omylistManual testing265266--2.583--
2017-11-16T23:15:00Gordon SpenceManual testing266267--5.166--
2019-01-12T08:34:57chuenkitManual testing267268--10.33--
2021-04-29T08:55:19TJAOIManual testing268269--20.67--


ECM factoring results:

Old Calculation Method

Total ECM effort:12.576 GHz-days
Estimated T-Level:22.125
DigitsB1CurvesCompleteFacMiss
2011000119 / 1001.19030.240%
2550000119 / 2800.42565.327%

New Calculation Method

Total ECM effort:12.576 GHz-days
Estimated T-Level:22.125
DigitsB1CompleteFacMiss
20110004.5991.006%
25500000.42565.344%
302500000.02797.350%
3510000000.00199.875%


ECM Summary

B1B2factorcurvesGHz-days
50000500000011211.73
50000675000070.845


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02T00:00:00ANONYMOUSv4_computersE57907DCBE1702670.223
2018-09-28T03:55:03kkmrkkblmbrbkoldE57907DCBE1702670.223


PRP results:
No PRP results for M2892787


P-1 factor-bounds graph:
B1 = 5000000, B2 = 200000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 2900000, B2 = 29000000 (P-1 stage 2)
B1 = 2900000 (P-1 stage 1)
B1 = 597196, B2 = 5971960 (P-1 stage 2)
B1 = 597196 (P-1 stage 1)
B1 = 298598, B2 = 2985980 (P-1 stage 2)
B1 = 298598 (P-1 stage 1)
B1 = 248832 (P-1 stage 1)
B1 = 172800 (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: 2022-06-08T22:21:59+00:00