is 2 108912187 - 1
has 32785836 decimal digits
takes 478.003 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-
PRP2E589A8D1C6D2140verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2802,248.293566.2500%7000002400000012.53342.6938%2,260.826867.1592%0.9092%
PrimeNet2728.780862.5000%4500002400000011.02915.5010%19.809864.5629%2.0629%
GPU72276140.516864.4737%7000002400000012.53343.9833%153.050265.8888%1.4151%
Difference+4+2,107.7767+1.7763%----1.2895%+2,107.7767+1.2704%+1.2704%

Known prime factors:
No known factors for M108912187

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-03-29T12:16:10KrieselManual testing70000024000000---12.53--2.694%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-04-28T03:28:00James Hintz4117263264--0.018--
2022-05-25T23:31:57LordJuliusManual testing21264--0.033--
2010-09-12T20:24:00ANONYMOUSback113264265--0.034--
2022-04-11T23:24:06Magallan3sManual testing21265--0.067--
2022-04-11T23:26:22Magallan3sManual testing250265--0.067--
2012-07-27T11:37:00Richardworkmy265266--0.069--
2013-09-26T07:27:00g0bManual testing266267--0.137--
2013-09-30T07:29:00g0bManual testing267268--0.274--
2013-10-05T14:06:00Per Jessenbeaufort3268269--0.549--
2013-10-09T23:53:00Per Jessenbeaufort3269270--1.098--
2013-10-18T00:30:00Per Jessenbeaufort3270271--2.196--
2015-01-31T12:31:00Jonathan WebbManual testing271272--4.391--
2019-08-01T13:50:26Niels_Mache_NextcloudManual testing272273--8.782--
2019-08-01T13:50:26Niels_Mache_NextcloudManual testing273274--17.56--
2020-03-27T19:42:41Will HockensmithManual testing274275--35.13--
2020-09-13T02:04:01ktonyGPU72_TF275276--70.26--
2021-01-16T15:55:44Alvin BunkManual testing276277--140.5--
2022-04-02T22:45:36Magallan3sManual testing277278--281.0--
Missing TF 78 - 79
2022-04-11T20:50:49Magallan3sManual testing279280--1,124--


ECM factoring results:
No ECM results for M108912187


Lucas-Lehmer results:
No L-L results for M108912187


PRP results:
dateuseridcompidcofactorsres64PRP
2022-04-05T13:58:03KrieselManual testing2E589A8D1C6D2140no
2022-04-05T21:14:27Magallan3sManual testing2E589A8D1C6D2140no
2022-04-06T13:26:04Magallan3sMagellan2E589A8D1C6D2140no


P-1 factor-bounds graph:
B1 = 700000, B2 = 24000000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
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108
TF factor-bounds graph:
280
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Last modified: 2022-05-25T23:31:57+00:00