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
187123Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
2187157245831237.7old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000478 / 1566
Estimated T-Level: 31.5
TF below 2^100 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver Kruse98F2597C5229BC8D1013
Verified2017-10-12kkmrkkblmbrbk98F2597C5229BC8D115950513
Verified2020-04-17Oliver KruseDA6E75DBA037718F110433953
Verified2023-08-24USAFSSDA6E75DBA037718F12617153
History
DateUserTypeResult
2023-08-24curtiscCERT
PRP Certification
Proof certified good
2023-08-24USAFSSC-PRP
M187123/218715724583 : DA6E75DBA037718F
PRP proof power = 5
PRP: Verified
Proof certified good
2021-04-22nordiNF-PP1
Start=2/7, B1=10000000, B2=1000000000
2020-04-17Oliver KruseC-PRP
M187123/218715724583 : DA6E75DBA037718F
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M187123/218715724583 : 98F2597C5229BC8D
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M187123/218715724583 : 98F2597C5229BC8D
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M187123/218715724583 : 98F2597C5229BC8D
PRP without proof (not generated)
2017-07-05kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12