is 2 1899917 - 1
has 571933 decimal digits
takes 0.103 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
Actual26715.639668.6567%500000290358684012.481210.4362%28.120871.9278%3.2710%
PrimeNet2570.010163.1579%90001600000.00143.0380%0.011564.2772%1.1193%
GPU722610.161765.5738%100001600000.00141.7273%0.163166.1684%0.5947%
Difference+6+15.4779+3.0829%+490000+2903426840+12.4798+8.7088%+27.9577+5.7593%+5.7593%

Known prime factors (5 factors, 223.6 bits, 0.01176641% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
189991715199337823.8584
22
-445.887e-133.146e-76.404e-7
189991726598839824.6657
7
2008-07-15171.178e-121.044e-71.601e-7
1899917750999191771136.12819764
22 × 34 × 61
2008-07-1581816.158e-96.372e-61.297e-5
18999173938635396939627042812168.416103652827911420
22 × 3 × 5 × 17 × 197 × 515839693
2020-10-1619751583969334.6422.21084.1291
189991716526008802418147721672270.485434913967357999
41 × 10607657740439
2020-10-314110607657740439234.1745,46284,910

26 Composite Factors:
exponentprime factorscomposite factordigitsbits*
18999174042847177697431548.522
189991711414689802439856491959.986
189991719975706591020355031960.793
1899917303617496290039549960615112684.650
189991759864646718214160077982616972892.274
1899917104763128802898232431749297592993.081
1899917251184377052919842137444532792994.343
1899917439572647448103121926917141132995.150
18999172957911999778373040635545189673732104.544
189991712411019253799934560554636914655933106.613
189991715923300998496568114344870735836978336116.939
189991766812128045459093609193029991114308136119.008
189991744958301300975417156334345516579486336939128.402
189991778677025058272980189805324177355208834339129.209
1899917188639264151993735963816833378495263138340130.471
1899917330118702957724597586728537996389024500140131.278
189991765089923239339971789794411952110521054692742138.901
18999171195838618018135663899175086565869587777902859147153.067
18999175017585416257352911910073776524421566478276433747155.136
1899917989323678618859888803578427976955670755869778739949162.759
18999171731316388765562375901283406613863459739881321775350163.566
189991748882479745115659082390203710497429257787785665719
079
53175.030
189991726314861246470796545844285229632139596572388549668
2229761
57187.424
189991774298128304168700637035947169450086492277642881703
3629050623
60198.887
189991713002172086610924523113847636727237307417868070889
69601549281
61199.694
189991719762439527639262970837165959727085691441677663099
237956703244026697
68223.552
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-04-12T01:08:05Lisander ViaeneDesktop5000002903586840-
skipped known factor: 15199337
skipped known factor: 26598839
skipped known factor: 75099919177
skipped known factor: 393863539693962704281
--12.48--10.436%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:47:00J FeitsmaManual testing??24.66581.78240e-150.2203.79862e-15
2008-07-15T07:47:00J FeitsmaManual testing??36.128111.33916e-90.2202.85399e-9


ECM factoring results:

Old Calculation Method

Total ECM effort:19.848 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:19.848 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110008.7930.015%
25500000.79745.060%
302500000.04995.187%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000281.942
50000500000020.139
50000500000010.069
50000660000021216.59
500006750000141.107


Lucas-Lehmer results:
No L-L results for M1899917


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T18:20:17Oliver KruseGTX-3
15199337
26598839
75099919177
01852935594A7A__no
2017-11-09T09:46:40kkmrkkblmbrbkold
15199337
26598839
75099919177
01852935594A7A__no
2020-10-16T11:59:16M Millercruncher
15199337
26598839
75099919177
393863539693962704281
F29E12F855AD070Ano
2020-10-31T21:24:38laxeye
15199337
26598839
75099919177
393863539693962704281
1652600880241814772167
F29E12F855AD070Ano
2020-11-01T06:34:45Poaopc-Home
15199337
26598839
75099919177
393863539693962704281
1652600880241814772167
F29E12F855AD070Ano


P-1 factor-bounds graph:
B1 = 500000, B2 = 2903586840 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
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109
1010
1011
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1014
TF factor-bounds graph:
267
2
220
230
240
250
260
270
280
290
2100
Last modified: 2022-04-12T01:08:05+00:00