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
15187Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
151871617.2old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001480 / 9201
Estimated T-Level: 40.8
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 KruseD88286CDA7C301B71013
Verified2017-10-12kkmrkkblmbrbkD88286CDA7C301B71759413
Verified2020-04-17Oliver Kruse492B8E9243E7B16111455353
Verified2024-07-01kkmrkkblmbrbk492B8E9243E7B1611540753
History
DateUserTypeResult
2025-02-03masserNF-PP1
Start=2/7, B1=355000000, B2=354645000000
2025-02-01masserNF-PP1
Start=104/31, B1=355000000, B2=354645000000
2025-01-11masserNF-PP1
Start=6/5, B1=355000000, B2=354645000000
2024-07-01kkmrkkblmbrbkC-PRP
M15187/151871 : 492B8E9243E7B161
PRP: Verified
PRP without proof (small exponent)
2024-03-07-Anonymous-NF-PM1
B1=100000000000, B2=122154521813133810
2022-03-31Ethan O'ConnorNF-PM1
B1=10000000000, B2=927264583755510
2022-02-06Lisander ViaeneNF-PM1
B1=50000
2020-04-17Oliver KruseC-PRP
M15187/151871 : 492B8E9243E7B161
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M15187/151871 : D88286CDA7C301B7
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M15187/151871 : D88286CDA7C301B7
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M15187/151871 : D88286CDA7C301B7
PRP without proof (not generated)