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
217643Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
435287618.7old
475767599928.82008-07-21 09:14:11
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000243 / 1566
Estimated T-Level: 30.8
TF below 2^97 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver Kruse09C81D82F0CC656E2013
Verified2017-10-12kkmrkkblmbrbk09C81D82F0CC656E210828213
Verified2020-04-17Oliver Kruse4092178878F4F45129689253
Verified (Factored)2022-05-12Jorge Coveiro4092178878F4F451112181753
Verified2023-08-03USAFSS4092178878F4F45121891553
History
DateUserTypeResult
2023-08-03David BarinaCERT
PRP Certification
Proof certified good
2023-08-03USAFSSC-PRP
M217643/435287/475767599 : 4092178878F4F451
PRP proof power = 5
PRP: Verified
Proof certified good
2022-05-12Jorge CoveiroC-PRP
M217643/435287 : 4092178878F4F451
PRP proof power = 5
PRP: Verified (Factored)
PRP proof never uploaded
2022-03-02Oliver KruseNF-PM1
B1=30000000, B2=10070832992220
2021-05-29Oliver KruseNF-PM1
B1=30000000, B2=3000000000
2021-05-02Dylan DelgadoNF-PM1
B1=6500000, B2=604500000
2020-04-17Oliver KruseC-PRP
M217643/435287/475767599 : 4092178878F4F451
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M217643/435287/475767599 : 09C81D82F0CC656E
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M217643/435287/475767599 : 09C81D82F0CC656E
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M217643/435287/475767599 : 09C81D82F0CC656E
PRP without proof (not generated)
2008-07-21J FeitsmaF
Factor: 475767599