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
1298197Composite: proven not-prime with both PRP and Lucas-Lehmer tests
TF
No factors below 271
TF target 260
TF below 2^81 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 26000000
B2 = 100185113490
ECM
DigitsB1Curves
2550000280 / 280
30250000105 / 640
Estimated T-Level: 25.8 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski6280
VerifiedRahn LiebermanBC401F94F65B26280
Verified2002-09-14S57483BC401F94F65B2628575096
Verified2016-06-01MadPooBC401F94F65B262833721
PRP
StatusDateUserResidueShiftTypeBase
Verified2025-08-23kkmrkkblmbrbk64E2B6109E8B6C12127322013
Verified2025-09-01Kriesel64E2B6109E8B6C12013
History
DateUserTypeResult
2025-09-02Oliver KruseCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-01KrieselC-PRP
64E2B6109E8B6C12
PRP proof power = 6
PRP: Verified
Proof certified good
2025-08-23Alex BozichCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-08-23kkmrkkblmbrbkC-PRP
64E2B6109E8B6C12
PRP proof power = 6
PRP: Verified
Proof certified good
2022-05-18Sid & AndyNF-PM1
B1=26000000, B2=100185113490
2018-10-13JossNF-PM1
B1=1298197, B2=142801670, E=12
2018-05-13JossNF-PM1
B1=1298197, B2=129819700, E=12
2016-08-27Bruno VictalNF-PM1
B1=2500000, B2=62500000, E=12
2016-08-07Bruno VictalNF-PM1
B1=2500000, B2=62500000, E=12
2016-06-01MadPooC-LL
BC401F94F65B2628
2016-03-22ramgeisNF
no factor from 2^70 to 2^71
2016-03-22ramgeisNF
no factor from 2^69 to 2^70
2016-03-22ramgeisNF
no factor from 2^68 to 2^69
2016-03-22ramgeisNF
no factor from 2^67 to 2^68
2016-03-16YxinityNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-09-28ramgeisNF
no factor from 2^65 to 2^66
2015-04-25monstNF
no factor from 2^64 to 2^65
2015-04-25omylistNF
no factor from 2^63 to 2^64
2013-11-13David CampeauNF-PM1
B1=1190000, B2=34510000, E=12
2013-01-03dbaughNF
no factor from 2^62 to 2^63
2011-05-09megavinkNF
no factor from 2^61 to 2^62
2009-02-17Sturle SundeNF
no factor from 2^60 to 2^61