Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
1953811Factored
FactorDigitsBitsDate
1213576424814253899933274312786.62020-02-25 02:53:33
ECM
DigitsB1Curves
2550000270 / 280
Estimated T-Level: 24.8
TF below 2^77 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Ars Technica Team Prime RibB96A81413F6628C10
Verified (Factored)1999-01-10Michael J. KilfoyleB96A81413F6628C11945035
Verified (Factored)2015-07-12MadPooB96A81413F6628C11304198
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-02-25Niels_Mache_NextcloudA71D91C2A64A17CD1165565753
Verified2020-02-27arnaudA71D91C2A64A17CD197192953
History
DateUserTypeResult
2020-02-27arnaudC-PRP
M1953811/121357642481425389993327431 : A71D91C2A64A17CD
PRP: Verified
PRP without proof (not generated)
2020-02-25Niels_Mache_NextcloudC-PRP
M1953811/121357642481425389993327431 : A71D91C2A64A17CD
PRP: Verified
PRP without proof (not generated)
2020-02-25KeysarecoolF-ECM
Factor: 121357642481425389993327431 / (ECM curve 3, B1=50000, B2=5000000, Sigma=303014763332831)
2019-05-13chuenkitNF
no factor from 2^67 to 2^68
2018-11-26JossNF-PM1
B1=1953811, B2=244226375, E=12
2018-05-11JossNF-PM1
B1=1953811, B2=195381100, E=12
2018-03-03JossNF-PM1
B1=1953811, B2=120000000, E=12
2018-02-05TJAOINF
no factor from 2^66 to 2^67
2018-01-22JossNF-PM1
B1=1953811, B2=60000000, E=12
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-09-07ramgeisNF
no factor from 2^65 to 2^66
2015-07-12MadPooC-LL
B96A81413F6628C1
2015-04-22lycornNF
no factor from 2^64 to 2^65
2015-04-22lycornNF
no factor from 2^63 to 2^64
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-05-16kurlyNF-PM1
B1=1000000, B2=30000000, E=12
2010-01-16S485122NF
no factor from 2^60 to 2^61