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
816587Factored
FactorDigitsBitsDate
4233871994688330491858.62007-09-03 02:54:26
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-28Oliver KruseB897F39350E9E3EC1013
Verified2017-10-14Oliver KruseB897F39350E9E3EC134868613
Verified2017-12-17ATHB897F39350E9E3EC157991613
Unverified (Reliable)2020-04-21Oliver KruseFB40A50C7EC82F__16356953
History
DateUserTypeResult
2023-02-21USAFSSNF-PM1
B1=1500000, B2=3613488450
2020-04-21Oliver KruseC-PRP
M816587/423387199468833049 : FB40A50C7EC82F__
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-12-17ATHC-PRP
M816587/423387199468833049 : B897F39350E9E3EC
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-10-14Oliver KruseC-PRP
M816587/423387199468833049 : B897F39350E9E3EC
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-09-28Oliver KruseC-PRP
M816587/423387199468833049 : B897F39350E9E3EC
PRP: Unverified (Reliable)
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=300000, B2=10000000, E=12
2007-09-03Team_BunduF-ECM
Factor: 423387199468833049