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
8161Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
6708343722.7old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000006537 / 9201
Estimated T-Level: 43.6
TF below 2^140 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse51D47019C7FCE8E11013
Verified2017-10-12kkmrkkblmbrbk51D47019C7FCE8E11568413
Verified2020-04-17Oliver KruseE98208C543BA7E681655553
Verified2024-07-01kkmrkkblmbrbkE98208C543BA7E681466553
History
DateUserTypeResult
2024-07-01kkmrkkblmbrbkC-PRP
M8161/6708343 : E98208C543BA7E68
PRP: Verified
PRP without proof (small exponent)
2023-06-03JacobZNF-PM1
B1=72000000000, B2=300970872589336950
2021-12-16Lisander ViaeneNF-PM1
B1=100000000
2020-04-17Oliver KruseC-PRP
M8161/6708343 : E98208C543BA7E68
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M8161/6708343 : 51D47019C7FCE8E1
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M8161/6708343 : 51D47019C7FCE8E1
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M8161/6708343 : 51D47019C7FCE8E1
PRP without proof (not generated)