is 2 3385087 - 1
has 1019013 decimal digits
takes 0.356 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L648CF7AC55954B90double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26817.608167.6471%10000001266688501.19507.6115%18.803170.1096%2.4626%
PrimeNet2600.045463.3333%140002800000.00432.8450%0.049764.3765%1.0432%
GPU722641.051565.6250%180003200000.00521.7906%1.056766.2405%0.6155%
Difference+4+16.5566+2.0221%+982000+126348850+1.1897+5.8210%+17.7463+3.8691%+3.8691%

Known prime factors (1 factor, 72.6 bits, 0.00214521% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
338508772440586966610693384312272.6171069995940526945
5 × 619 × 18223 × 18971497
2021-02-251822318971497539.700.16000.2940

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-10T06:11:00Carsten Kossendeydurandal15000206250---0.004--0.811%
2011-10-21T15:32:00harleeP4_260060000930000---0.016--1.881%
2014-07-04T02:22:00Jocelyn LaroucheManual testing7896178961---0.012--0.755%
2014-10-12T23:58:00Jocelyn LaroucheManual testing9792297922---0.015--0.859%
2015-09-20T09:11:00Squeeky_SquirrelP4_26001550004030000---0.056--3.217%
2017-03-31T00:48:08Jocelyn Larouchelow 4M31000031000006---0.070--3.353%
2022-02-25T17:22:03Jocelyn LaroucheManual testing200000200000---0.030--1.270%
2022-04-09T09:24:11Jocelyn LaroucheManual testing10000001000000---0.152--2.570%
2022-04-10T15:21:20Jocelyn LaroucheManual testing1000000126668850-
skipped known factor: 7244058696661069338431
--1.195--7.612%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:27Mark RoseManual testing21260--0.045--
2009-03-25T20:43:00S485122USB-Z260261--0.045--
2011-09-09T07:51:00Grant McCrackenhome261262--0.091--
2012-11-15T00:22:00GrunwalderGIMPManual testing21263--0.471--
2016-02-23T16:29:27Mark RoseManual testing262263--0.290--
2015-02-15T12:50:00VictordeHollanderManual testing263264--0.580--
2015-02-15T12:50:00VictordeHollanderManual testing264265--1.104--
2015-04-02T08:41:00Gordon SpenceManual testing265266--2.208--
2017-03-10T14:13:05Gordon SpenceManual testing266267--4.415--
2018-10-01T11:53:17TJAOIManual testing267268--8.830--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.343 GHz-days
Estimated T-Level:0.800
DigitsB1CurvesCompleteFacMiss
201100016 / 1000.16085.146%
255000016 / 2800.05794.436%

New Calculation Method

Total ECM effort:2.343 GHz-days
Estimated T-Level:0.800
DigitsB1CompleteFacMiss
20110000.61554.043%
25500000.05794.465%
302500000.00499.641%


ECM Summary

B1B2factorcurvesGHz-days
500005000000152.197
50000500000010.146


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-04T00:00:00sssvsv4_computers648CF7AC55954B900.356


PRP results:
dateuseridcompidcofactorsres64PRP
2021-02-26T10:44:51Massimo Cappelli (ik5pwa)maxlinux_8
7244058696661069338431
C3E6842ED3FFC1__no
2021-02-27T04:00:04Richard Thomasdjinn.pc
7244058696661069338431
C3E6842ED3FFC1E4no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 126668850 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 310000, B2 = 3100000 (P-1 stage 2)
B1 = 155000, B2 = 4030000 (P-1 stage 2)
B1 = 310000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 155000 (P-1 stage 1)
B1 = 60000, B2 = 930000 (P-1 stage 2)
B1 = 97922 (P-1 stage 1)
B1 = 78961 (P-1 stage 1)
B1 = 60000 (P-1 stage 1)
B1 = 15000, B2 = 206250 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
103
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105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
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266
265
264
263
262
261
260
250
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290
2100
Last modified: 2022-04-10T15:21:20+00:00