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
43853Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
47329355823847691652.1old
36216731906870074798934036798358545795269689498749306947988764163207.82025-08-27 12:55:39
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000001372 / 4588
Estimated T-Level: 36.5
TF below 2^116 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-09-21Oliver Kruse19E5F7AE67FA06791013
Verified (Factored)2017-10-13kkmrkkblmbrbk19E5F7AE67FA06791164613
Verified (Factored)2020-04-17Oliver KruseACEBA160AA097B4F14154153
Verified (Factored)2024-07-01kkmrkkblmbrbkACEBA160AA097B4F191953
Verified2025-08-27masserACEBA160AA097B4F22221353
P-1 factors
DateFactorB1B2
2025-08-2736216731906870074798934036798358545795269689498749306947988764182000000001800173412167130
History
DateUserTypeResult
2025-08-27masserC-PRP
M43853/4732935582384769/362167319068700747989340367983585457952696894987493069479887641 : ACEBA160AA097B4F
PRP: Verified
PRP without proof (small exponent)
2025-08-27masserF-PM1
Factor: 362167319068700747989340367983585457952696894987493069479887641 / (P-1, B1=8200000000, B2=1800173412167130)
2024-07-01kkmrkkblmbrbkC-PRP
M43853/4732935582384769 : ACEBA160AA097B4F
PRP: Verified
PRP without proof (small exponent)
2023-04-18JacobZNF-PM1
B1=820000000, B2=1012781191031610
2021-06-29ATHNF-PP1
Start=2/7, B1=100000000, B2=10000000000
2020-04-17Oliver KruseC-PRP
M43853/4732935582384769 : ACEBA160AA097B4F
PRP: Verified
PRP without proof (small exponent)
2017-10-13kkmrkkblmbrbkC-PRP
M43853/4732935582384769 : 19E5F7AE67FA0679
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M43853/4732935582384769 : 19E5F7AE67FA0679
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M43853/4732935582384769 : 19E5F7AE67FA0679
PRP without proof (not generated)
2016-09-19kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12