Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
305771Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
611543619.2old
15288551823.92008-07-21 09:16:22
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000167 / 1566
Estimated T-Level: 30.5
TF below 2^96 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver Kruse2B49126D77CDE26A2013
Verified2017-10-12Oliver Kruse2B49126D77CDE26A226738413
Verified2017-12-11ATH2B49126D77CDE26A29391913
Verified2020-04-18Oliver KruseFE82C89B343B0247224846753
Verified (Factored)2022-05-12Jorge CoveiroFE82C89B343B0247129157853
Verified2024-07-08kkmrkkblmbrbkFE82C89B343B024726871453
History
DateUserTypeResult
2024-07-08Ducho_YYZCERT
PRP Certification
Proof certified good
2024-07-08kkmrkkblmbrbkC-PRP
M305771/15288551/611543 : FE82C89B343B0247
PRP proof power = 5
PRP: Verified
Proof certified good
2024-02-23Denial140NF-PM1
B1=10000000, B2=206662045590
2024-02-22Denial140NF-PM1
B1=10000000
2023-03-17Denial140NF-PM1
B1=1000000, B2=65871826020
2022-05-12Jorge CoveiroC-PRP
M305771/611543 : FE82C89B343B0247
PRP proof power = 5
PRP: Verified (Factored)
PRP proof never uploaded
2022-02-06Lisander ViaeneNF-PM1
B1=50000
2020-04-18Oliver KruseC-PRP
M305771/611543/15288551 : FE82C89B343B0247
PRP: Verified
PRP without proof (small exponent)
2017-12-11ATHC-PRP
M305771/611543/15288551 : 2B49126D77CDE26A
PRP: Verified
PRP without proof (small exponent)
2017-10-12Oliver KruseC-PRP
M305771/611543/15288551 : 2B49126D77CDE26A
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M305771/611543/15288551 : 2B49126D77CDE26A
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M305771/611543/15288551 : 2B49126D77CDE26A
PRP without proof (not generated)
2008-07-21J FeitsmaF
Factor: 15288551