is 2 1887079 - 1
has 568068 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.746068.6567%1000000300000000.20296.2131%15.948970.6041%1.9474%
PrimeNet2570.010263.1579%90001600000.00143.0342%0.011564.2758%1.1179%
GPU722610.162865.5738%100001500000.00141.6927%0.164266.1565%0.5827%
Difference+6+15.5832+3.0829%+990000+29850000+0.2016+4.5204%+15.7848+4.4476%+4.4476%

Known prime factors (3 factors, 136.5 bits, 0.00723294% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
188707945289897825.43312
22 × 3
-442.375e-123.146e-76.404e-7
18870795107228347191238.894135321
3 × 43 × 1049
2008-07-154310492.504e-87.694e-68.363e-6
188707952938279111260238090492272.1651402651375783956
22 × 32 × 31 × 1256856071491
2021-02-21311256856071491826.705,386.610,061

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1887079231305845799715339432064.326
18870792397569208306227723313768779533097.597
1887079270367879728484527900859124357223134111.059
188707912244933425011452234723535953648825405020742136.491
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:16alpertronManual testing5000001500000012-
skipped known factor: 45289897
skipped known factor: 510722834719
--0.101--5.087%
2021-02-21T12:24:00riccardo ubertiColab_noGPU1410000003000000012-
skipped known factor: 45289897
skipped known factor: 510722834719
--0.203--6.213%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:47:00J FeitsmaManual testing??38.894125.63249e-90.2181.20127e-8


ECM factoring results:

Old Calculation Method

Total ECM effort:19.799 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.799 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
201100010.6150.002%
25500000.97737.642%
302500000.06293.989%
3510000000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
500005000000352.426
50000500000070.485
50000660000021616.89


Lucas-Lehmer results:
No L-L results for M1887079


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T15:15:36Oliver KruseGTX-0
45289897
510722834719
43F1C72265AC4F__no
2017-11-08T15:48:31Chang Chia-Tcheexbpc13
45289897
510722834719
43F1C72265AC4F__no
2021-02-21T09:56:20riccardo ubertiColab_noGPU12
45289897
510722834719
5293827911126023809049
94FCDAB82DCC6088no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
267
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Last modified: 2021-10-28T13:39:54+00:00