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
1562971Composite: 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 = 19400000
B2 = 99445962000
ECM
DigitsB1Curves
2550000280 / 280
30250000105 / 640
Estimated T-Level: 25.8 ⓘ
LL
StatusDateUserResidueShift
VerifiedThe Vanguard (Nelson Jones, Mohammad Malik, Anthony Joseph, Art Mandelin, Ed)8C681ADC434C7D1E0
Verified1998-11-14Barry Goldstein8C681ADC434C7D1E770693
Verified2015-07-01MadPoo8C681ADC434C7D1E155446
PRP
StatusDateUserResidueShiftTypeBase
Verified2025-09-02Kriesel13155C344EB9ABBA013
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
13155C344EB9ABBA
PRP proof power = 6
PRP: Verified
Proof certified good
2023-10-12Sid & AndyNF-PM1
B1=19400000, B2=99445962000
2023-05-14JossNF-PM1
B1=10001000, B2=8289448440
2023-02-28JossNF-PM1
B1=10001000, B2=3563469000
2022-12-23JossNF-PM1
B1=10001000, B2=1200523170
2018-06-08ramgeisNF
no factor from 2^67 to 2^68
2018-01-22TJAOINF
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 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-10-11ramgeisNF
no factor from 2^65 to 2^66
2015-07-01MadPooC-LL
8C681ADC434C7D1E
2015-04-21VictordeHollanderNF-PM1
B1=10000000, B2=200000000, E=12
2015-02-22snme2pm1NF
no factor from 2^64 to 2^65
2015-02-22snme2pm1NF
no factor from 2^63 to 2^64
2013-11-28David CampeauNF-PM1
B1=950000, B2=27550000, E=12
2011-01-29James HeinrichNF-PM1
B1=80000, B2=1380000, E=6
2010-05-17GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-05-02Architects CubedNF
no factor from 2^60 to 2^61