is 2 38197477 - 1
has 11498587 decimal digits
takes 49.338 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP350E877C252946__PRP-tested

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual277801.313866.2338%250000002500692480299.44679.3339%1,100.760569.3855%
Target27112.516063.3803%28000090000001.41424.1895%13.930264.9145%
Difference+6+788.7978+2.8535%+24720000+2491692480+298.0325+5.1445%+1,086.8303+4.4710%

Known prime factors (9 factors, 429.5 bits, 0.00112436% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
38197477229184863927.7723
3		-134.684e-132.077e-63.812e-6
3819747715278990811030.50920
22 × 5		2008-09-10453.761e-127.594e-61.525e-5
38197477167304949271133.962219
3 × 73		2008-09-103733.138e-111.276e-51.453e-5
3819747714426423113371340.39218884
22 × 4721		2008-09-10447214.170e-90.00050.0009
3819747726758860537591341.28335027
35027		2008-09-101350271.213e-80.00360.0067
3819747724398084570333511651.11631936775
52 × 132 × 7559		2008-09-1016975591.352e-50.00110.0014
38197477311680040719483077432064.757407985114723
3 × 135995038241		2018-01-0431359950382410.131413,87725,919
381974774707933378248803282492168.6746162623487212
22 × 41 × 43 × 873883081		2019-12-08438738830812.668989.173166.55
3819747723818263278232605128092271.01331177796478852
22 × 3 × 2598149706571		2019-12-134259814970657116.126265,120495,169

502 Composite Factors:
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-12-14Seth_TrManual testing100000010000000012-
skipped known factor: 229184863
skipped known factor: 1527899081
skipped known factor: 16730494927
skipped known factor: 1442642311337
skipped known factor: 2675886053759
skipped known factor: 2439808457033351
--11.98--4.314%
2021-09-13Seth_TrManual testing4000000400000000-
skipped known factor: 229184863
skipped known factor: 1527899081
skipped known factor: 16730494927
skipped known factor: 1442642311337
skipped known factor: 2675886053759
skipped known factor: 2439808457033351
--47.90--6.301%
2022-01-02Seth_TrManual testing250000002500692480-
skipped known factor: 229184863
skipped known factor: 1527899081
skipped known factor: 16730494927
skipped known factor: 1442642311337
skipped known factor: 2675886053759
skipped known factor: 2439808457033351
skipped known factor: 470793337824880328249
--299.4--9.334%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-10Will EdgingtonManual testing??40.392133.35327e-10112.67.65330e-10
2008-09-10Will EdgingtonManual testing??30.509101.62113e-14112.63.69996e-14
2008-09-10Will EdgingtonManual testing??33.962111.42011e-12112.63.24117e-12
2008-09-10Will EdgingtonManual testing??51.116165.66908e-6112.61.29388e-5
2008-09-10Will EdgingtonManual testing??41.283134.46051e-9112.61.01804e-8
2018-01-04TJAOIManual testing264265*64.757200.038112.40.087
2022-11-17LordJuliusManual testing2126530.509103.76101e-12112.68.58391e-12
2022-11-17LordJuliusManual testing2126527.77294.68404e-13112.61.06906e-12
2022-11-17LordJuliusManual testing2126540.392134.17000e-9112.69.51737e-9
2022-11-17LordJuliusManual testing2126533.962113.13785e-11112.67.16164e-11
2022-11-17LordJuliusManual testing2126551.116161.35225e-5112.63.08629e-5
2022-11-17LordJuliusManual testing2126564.471200.094112.40.215
2022-11-17LordJuliusManual testing2126541.283131.21299e-8112.62.76845e-8
2022-11-17LordJuliusManual testing2126564.757200.131112.40.299
2022-11-17LordJuliusManual testing2126558.281180.001112.60.003
2022-11-17LordJuliusManual testing2126561.734190.014112.60.033
2022-04-06James HeinrichManual testing265266--0.196--
2019-06-17Seth_TrManual testing266267--0.391--
2019-06-20Seth_TrManual testing267268--0.783--
2019-12-08Seth_TrManual testing26826968.674211.108109.52.460
2021-08-06Seth_TrManual testing268269
skipped known factors(?)
--1.565--
2021-08-06Seth_TrManual testing269270--3.130--
2021-08-06Seth_TrManual testing270271--6.260--
2019-12-13Seth_TrManual testing27127271.013223.610100.17.323
2021-08-06Seth_TrManual testing271272
skipped known factors(?)
--12.52--
2019-12-15Seth_TrManual testing272273--25.04--
2019-12-15Seth_TrManual testing273274--50.08--
2019-12-15Seth_TrManual testing274275--100.2--
2019-12-31Seth_TrManual testing275276--200.3--
2020-01-03Seth_TrManual testing276277--400.7--


ECM factoring results:
No ECM results for M38197477


Lucas-Lehmer results:
No L-L results for M38197477


PRP results:
dateuseridcompidcofactorsres64PRP
2020-05-21JaytholomewJaytholomew
229184863
1527899081
16730494927
1442642311337
2675886053759
2439808457033351
31168004071948307743
470793337824880328249
2381826327823260512809
350E877C252946__no
2021-01-10Richard Thomasdjinn.pc
229184863
1527899081
16730494927
1442642311337
2675886053759
2439808457033351
31168004071948307743
470793337824880328249
2381826327823260512809
350E877C25294650no


P-1 factor-bounds graph:
B1 = 25000000, B2 = 2500692480 (P-1 stage 2)
B1 = 4000000, B2 = 400000000 (P-1 stage 2)
B1 = 25000000 (P-1 stage 1)
B1 = 1000000, B2 = 100000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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2
this exponent TF target: 71
TF double-checked to: 67.8
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Last modified: 2023-03-25T13:08:14+00:00