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
25247Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
656423619.3old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001689 / 9201
Estimated T-Level: 40.9
TF below 2^131 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse05492DDFF586A44C1013
Verified2017-10-12kkmrkkblmbrbk05492DDFF586A44C1682713
Verified2020-04-17Oliver KruseDAEE7B0CFB97308D1902353
Verified2024-07-01kkmrkkblmbrbkDAEE7B0CFB97308D12203353
History
DateUserTypeResult
2024-11-21masserNF-PP1
Start=2/7, B1=100000000, B2=99900000000
2024-11-15masserNF-PP1
Start=6/5, B1=100000000, B2=99900000000
2024-11-09masserNF-PP1
Start=83/11, B1=100000000, B2=99900000000
2024-07-01kkmrkkblmbrbkC-PRP
M25247/656423 : DAEE7B0CFB97308D
PRP: Verified
PRP without proof (small exponent)
2024-02-28nordiNF-PM1
B1=8000000000, B2=2427250412837250
2023-04-29nordiNF-PM1
B1=8000000000
2020-04-17Oliver KruseC-PRP
M25247/656423 : DAEE7B0CFB97308D
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M25247/656423 : 05492DDFF586A44C
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M25247/656423 : 05492DDFF586A44C
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M25247/656423 : 05492DDFF586A44C
PRP without proof (not generated)
2016-12-09kkmrkkblmbrbkNF-PM1
B1=500000000, B2=10000000000, E=12