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
1857209Composite: proven not-prime with both PRP and Lucas-Lehmer tests
TF
No factors below 268
TF target 261
TF below 2^81 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 25000000
B2 = 69189473430
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 640
Estimated T-Level: 25.8
LL
StatusDateUserResidueShift
VerifiedRich HarmsFE3B87A728D50F520
Verified1999-02-07Eric WhitneyFE3B87A728D50F521179109
Verified2015-07-16MadPooFE3B87A728D50F52602308
PRP
StatusDateUserResidueShiftTypeBase
Verified2025-09-02KrieselC28D1A0E052B2B18013
History
DateUserTypeResult
2025-09-03JJCCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
C28D1A0E052B2B18
PRP proof power = 6
PRP: Verified
Proof certified good
2023-12-26kurlyNF-PM1
B1=25000000, B2=69189473430
2023-12-10JossNF-PM1
B1=3107817, B2=17517277050
2023-06-09JossNF-PM1
B1=1857209, B2=8441116320
2023-01-09JossNF-PM1
B1=1857209, B2=1645764120
2022-11-01masserNF-PP1
Start=2/7, B1=800000, B2=25600000
2022-10-29masserNF-PP1
Start=6/5, B1=400000, B2=10800000
2022-10-27masserNF-PP1
Start=72/23, B1=200000, B2=4400000
2019-06-03TJAOINF
no factor from 2^67 to 2^68
2018-10-25JossNF-PM1
B1=1857209, B2=204292990, E=12
2018-08-15JossNF-PM1
B1=1857209, B2=185720900, E=12
2018-07-12JossNF-PM1
B1=1857209, B2=92860450, E=12
2018-06-04TJAOINF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-09-09ramgeisNF
no factor from 2^65 to 2^66
2015-07-26mikrNF-PM1
B1=2780000, B2=91760000, E=12
2015-07-16MadPooC-LL
FE3B87A728D50F52
2015-05-06snme2pm1NF
no factor from 2^64 to 2^65
2015-05-06snme2pm1NF
no factor from 2^63 to 2^64
2014-09-25JossNF-PM1
B1=169120
2014-05-26JossNF-PM1
B1=134560
2011-02-07Carsten KossendeyNF-PM1
B1=100000, B2=1700000, E=6
2011-01-21GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-04-13Architects CubedNF
no factor from 2^60 to 2^61