Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
13997Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
83983516.4old
291781463928.12008-08-26 19:58:41
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001324 / 9201
Estimated T-Level: 40.7
TF below 2^130 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse6EE259077100E80E2013
Verified2017-10-12kkmrkkblmbrbk6EE259077100E80E21060913
Verified2020-04-17Oliver KruseAB31EC782A162282288053
Verified2024-07-01kkmrkkblmbrbkAB31EC782A1622822789253
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M13997/291781463/83983 : AB31EC782A162282
PRP: Verified
PRP without proof (small exponent)
2024-01-29-Anonymous-NF-PM1
B1=100000000000, B2=122154521813133810
2023-05-22JacobZNF-PM1
B1=7800000000, B2=32022192391138950
2023-02-11USAFSSNF-PM1
B1=30000000, B2=2010341563230
2022-02-06Lisander ViaeneNF-PM1
B1=50000
2020-04-17Oliver KruseC-PRP
M13997/83983/291781463 : AB31EC782A162282
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M13997/83983/291781463 : 6EE259077100E80E
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M13997/83983/291781463 : 6EE259077100E80E
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M13997/83983/291781463 : 6EE259077100E80E
PRP without proof (not generated)
2008-08-26-Anonymous-F
Factor: 291781463