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:





MnDetails
Fermat F28
Composite: 1 known prime factor
Trial Factored to 268
TF target 280
Assignments
AssignedUserWork TypeStage% DoneUpdatedEst CompleteExpired
2026-01-12Jacques MOLNEECM2026-03-092026-03-28
Factored
FactorDigitsBitsDate
17667309745512676065292270.61997-02-05
ECM
DigitsB1Curves
2550000280 / 280
30250000162 / 640
Estimated T-Level: 26.3 ⓘ
TF below 2^82 is very unlikely to find new factors due to ECM effort.
History
DateUserTypeResult
2025-07-17Anton RepkoNF-PM1B1=500000000, B2=3300092765970
2021-04-28ATHNF-PP1Start=6/5, B1=500000, B2=20000000
2021-04-26ATHNF-PP1Start=2/7, B1=100000, B2=10000000