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
1287997Composite: proven not-prime with both PRP and Lucas-Lehmer tests
TF
No factors below 268
TF target 260
TF below 2^81 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 26000000
B2 = 133359018870
ECM
DigitsB1Curves
2550000280 / 280
30250000105 / 640
Estimated T-Level: 25.8 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski39E0
VerifiedJoel Armengaud58EE15D76340439E0
Verified2002-09-07S5748358EE15D76340439E10380
Verified2016-06-01MadPoo58EE15D76340439E805439
PRP
StatusDateUserResidueShiftTypeBase
Verified2025-08-19kkmrkkblmbrbkFEE59E4D47CAC99A66647013
Verified2025-09-01KrieselFEE59E4D47CAC99A013
History
DateUserTypeResult
2025-09-02timc995CERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-01KrieselC-PRP
FEE59E4D47CAC99A
PRP proof power = 6
PRP: Verified
Proof certified good
2025-08-19Theo PolidanoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-08-19kkmrkkblmbrbkC-PRP
FEE59E4D47CAC99A
PRP proof power = 6
PRP: Verified
Proof certified good
2022-05-09Sid & AndyNF-PM1
B1=26000000, B2=133359018870
2020-03-19Gordon SpenceNF
no factor from 2^67 to 2^68
2018-10-13JossNF-PM1
B1=1287997, B2=141679670, E=12
2018-09-06YxinityNF
no factor from 2^66 to 2^67
2018-05-12JossNF-PM1
B1=1287997, B2=128799700, E=12
2018-05-12JossNF-PM1
B1=1287997, B2=53415780, E=12
2016-08-27Bruno VictalNF-PM1
B1=2500000, B2=62500000, E=12
2016-08-06Bruno VictalNF-PM1
B1=2500000, B2=62500000, E=12
2016-06-01MadPooC-LL
58EE15D76340439E
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-09-27ramgeisNF
no factor from 2^65 to 2^66
2015-04-15monstNF
no factor from 2^64 to 2^65
2015-04-13omylistNF
no factor from 2^63 to 2^64
2013-11-14David CampeauNF-PM1
B1=1195000, B2=34655000, E=12
2012-10-18dbaughNF
no factor from 2^62 to 2^63
2011-05-09megavinkNF
no factor from 2^61 to 2^62
2009-02-16Sturle SundeNF
no factor from 2^60 to 2^61