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

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Exponent Range:










MnStatusDetails
15091247Factored
FactorDigitsBitsDate
863558608970771532940127532686.22022-08-11 18:07:03
ECM
DigitsB1Curves
255000014 / 280
Estimated T-Level: 20.3 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2002-09-07Roberto Bardin126E5C487BBB63C39732341
Verified (Factored)2005-09-22Ars Technica Team Prime Rib126E5C487BBB63C312801963
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2023-06-01Dobri02120DC43AE0D10211225973153
History
DateUserTypeResult
2023-11-04nordiNF-PM1
B1=569000, B2=574704900
2023-10-22nordiNF-PM1
B1=569000
2023-06-01S00030CERT
PRP Certification
Proof certified good
2023-06-01DobriC-PRP
M15091247/86355860897077153294012753 : 02120DC43AE0D102
PRP proof power = 8
PRP: Verified
Proof certified good
2022-08-11ATHF-PP1
Start=2/7, B1=1000000, B2=28000000, Factor: 86355860897077153294012753
2022-01-16Architects CubedNF
no factor from 2^72 to 2^73
2021-10-09-Anonymous-NF
no factor from 2^71 to 2^72
2021-09-02SRBaseNF
no factor from 2^70 to 2^71
2021-07-06lycornNF
no factor from 2^69 to 2^70
2017-10-08ramgeisNF
no factor from 2^68 to 2^69
2016-07-14mikrNF
no factor from 2^67 to 2^68
2015-05-20Squeeky_SquirrelNF-PM1
B1=285000, B2=6911250, E=6
2014-06-11NesowaNF
no factor from 2^66 to 2^67
2014-06-11NesowaNF
no factor from 2^65 to 2^66