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
5821
Composite, with 4 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
88805177826.4old
10354120153578011649.9old
345382338135626637894440549095324934111.4old
3634820212072328621804556095551079227665035084727487548753759194.52024-02-02 14:53:02
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000004908 / 16550
Estimated T-Level: 46.5 ⓘ
TF below 2^149 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
No proof (small exponent)
2017-09-21Oliver KruseEC3E3471053AEAF23013
Factored
No proof (small exponent)
2017-10-02kkmrkkblmbrbkEC3E3471053AEAF23013
Factored
No proof (small exponent)
2017-12-07ATHEC3E3471053AEAF23533713
Factored
No proof (small exponent)
2020-04-17Oliver Kruse277CD0A8346882313271353
Verified
No proof (small exponent)
2024-02-03Ryan Propper277CD0A8346882314167753
History
DateUserTypeResult
2025-05-29masserNF-PP1Start=134/41, B1=1500000000, B2=1498500000000
2024-02-03Ryan PropperC-PRPM5821/88805177/1035412015357801/3453823381356266378944405490953249/36348202120723286218045560955510792276650350847274875487537 : 277CD0A834688231
2024-02-02Ryan PropperF-ECMFactor: 36348202120723286218045560955510792276650350847274875487537 / ECM curve 6, B1=260000000, B2=7300371108030, Edwards Sigma=5587594833649672
2023-07-21-anonymous-NF-PM1B1=43000000000, B2=180123354312952050
2021-07-05ViliamFNF-PM1B1=1000000000, B2=201000000000
2020-04-17Oliver KruseC-PRPM5821/88805177/1035412015357801/3453823381356266378944405490953249 : 277CD0A834688231
2017-12-07ATHC-PRPM5821/88805177/1035412015357801/3453823381356266378944405490953249 : EC3E3471053AEAF2
2017-10-02kkmrkkblmbrbkC-PRPM5821/88805177/1035412015357801/3453823381356266378944405490953249 : EC3E3471053AEAF2
2017-09-21Oliver KruseC-PRPM5821/known_factors : EC3E3471053AEAF2