Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
15152857Factored
FactorDigitsBitsDate
138475639312648995162972373.62022-11-22 07:32:52
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
Bad2002-04-28Calvin Krusen35B4308D1BF197871499709
Verified (Factored)2006-09-04Ulf Kinder423FD11C46324FA614981840
Verified (Factored)2006-10-01Mikael Modin423FD11C46324FA61849044
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2023-06-23Bricyn Jameson9FB4C76AB97E4B831387805253
History
DateUserTypeResult
2023-11-05nordiNF-PM1
B1=480000, B2=449768550
2023-10-22nordiNF-PM1
B1=480000
2023-06-23numeroPrimoCERT
PRP Certification
Proof certified good
2023-06-23Bricyn JamesonC-PRP
M15152857/13847563931264899516297 : 9FB4C76AB97E4B83
PRP proof power = 8
PRP: Verified
Proof certified good
2022-11-22ATHF-PP1
Start=2/7, B1=1000000, B2=29000000, Factor: 13847563931264899516297
2021-10-10-Anonymous-NF
no factor from 2^71 to 2^72
2021-09-02SRBaseNF
no factor from 2^70 to 2^71
2021-06-30lycornNF
no factor from 2^69 to 2^70
2017-12-24ramgeisNF
no factor from 2^68 to 2^69
2017-12-24ramgeisNF
no factor from 2^67 to 2^68
2016-03-16Mark RoseNF
no factor from 2^65 to 2^66
2014-05-14NesowaNF
no factor from 2^66 to 2^67