is 2 38118737 - 1
has 11474884 decimal digits
takes 49.237 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-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual274100.367164.8649%750000165000003.01183.9866%103.378966.2656%
Target27112.541863.3803%280000720000007.84284.1884%20.384764.9140%
Difference+3+87.8252+1.4846%+470000-55500000-4.8310-0.2017%+82.9942+1.3515%

Known prime factors (8 factors, 334.3 bits, 0.00087699% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
38118737533662319928.9917
7		-179.396e-132.485e-63.812e-6
38118737112831461531133.393148
22 × 37		2008-09-104373.098e-111.086e-51.525e-5
38118737386523993191135.170507
3 × 132		2008-09-101691691.333e-100.00030.0006
381187371286126186391236.9041687
7 × 241		2008-09-1072413.279e-103.699e-54.584e-5
381187376910164643371239.3309064
23 × 11 × 103		2008-09-10111033.769e-92.999e-54.193e-5
3811873733205231800711341.59543555
5 × 31 × 281		2008-09-10312811.097e-88.357e-50.0001
381187373696638470924791548.3934848847
4848847		2008-09-10148488471.509e-60.49480.9241
3811873716934281288230786132472270.52022212542467279
29 × 43 × 661 × 26948237		2012-02-266612694823712.2422.75105.1359

247 Composite Factors:
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
unknown75000016500000-
skipped known factor: 533662319
--3.012--3.987%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-10Will EdgingtonManual testing??33.393119.61689e-13112.42.19597e-12
2008-09-10Will EdgingtonManual testing??36.904128.76957e-11112.42.00248e-10
2008-09-10Will EdgingtonManual testing??41.595133.28534e-9112.47.50190e-9
2008-09-10Will EdgingtonManual testing??48.393155.25282e-7112.41.19945e-6
2008-09-10Will EdgingtonManual testing??35.170111.31777e-11112.43.00907e-11
2008-09-10Will EdgingtonManual testing??39.330121.84811e-9112.44.22006e-9
2012-02-26James HeinrichManual testing??70.520225.97399.912.12
2022-11-17LordJuliusManual testing2126633.393113.09820e-11112.47.07458e-11
2022-11-17LordJuliusManual testing2126636.904123.27858e-10112.47.48647e-10
2022-11-17LordJuliusManual testing2126664.161200.143112.20.325
2022-11-17LordJuliusManual testing2126641.595131.09705e-8112.42.50506e-8
2022-11-17LordJuliusManual testing2126648.393151.50899e-6112.43.44569e-6
2022-11-17LordJuliusManual testing2126635.170111.33259e-10112.43.04290e-10
2022-11-17LordJuliusManual testing2126628.99199.39556e-13112.42.14543e-12
2022-11-17LordJuliusManual testing2126662.385190.017112.40.038
2022-11-17LordJuliusManual testing2126665.896200.263112.00.598
2022-11-17LordJuliusManual testing2126639.330123.76941e-9112.48.60724e-9
2019-06-17Seth_TrManual testing266267--0.392--
2019-06-20Seth_TrManual testing267268--0.784--
2021-08-06Seth_TrManual testing268269--1.568--
2019-12-04Seth_TrManual testing269270--3.137--
2021-08-06Seth_TrManual testing270271
skipped known factors(?)
--6.273--
2022-11-17LordJuliusManual testing27027170.520225.97399.912.12
2019-12-10Seth_TrManual testing271272--12.55--
2019-12-15Seth_TrManual testing272273--25.09--
2020-01-03Seth_TrManual testing273274--50.19--


ECM factoring results:
No ECM results for M38118737


Lucas-Lehmer results:
No L-L results for M38118737


PRP results:
dateuseridcompidcofactorsres64PRP
2017-12-05ATHManual testing
533662319
11283146153
38652399319
128612618639
691016464337
3320523180071
369663847092479
1693428128823078613247
428FC5CF49B4FF__no
2020-05-30JaytholomewJaytholomew
533662319
11283146153
38652399319
128612618639
691016464337
3320523180071
369663847092479
1693428128823078613247
428FC5CF49B4FFA6no


P-1 factor-bounds graph:
B1 = 750000, B2 = 16500000 (P-1 stage 2)
B1 = 750000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
274
273
272
271
270
269
268
267
266
2
this exponent TF target: 71
TF double-checked to: 67.8
250
260
270
280
Last modified: 2023-06-05T21:50:05+00:00