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
6221Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
5551900290219379609478141451193098.8old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001429 / 9201
Estimated T-Level: 40.8
TF below 2^130 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse6D965766ADC67B2E1013
Verified2017-10-12kkmrkkblmbrbk6D965766ADC67B2E1238413
Verified2020-04-17Oliver Kruse14EADB5C389D4D021577453
Verified2024-02-03Wentao Huang14EADB5C389D4D021117153
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2024-10-21Denial140factor ECM small0.00 % 2024-10-24
2024-10-21Denial140factor ECM small0.00 % 2024-10-24
2024-10-21Denial140factor ECM small0.00 % 2024-10-24
2024-10-21Denial140factor ECM small0.00 % 2024-10-24
2024-10-21Denial140factor ECM small0.00 % 2024-10-24
2024-10-21Denial140factor ECM small0.00 % 2024-10-24
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M6221/555190029021937960947814145119 : 14EADB5C389D4D02
PRP: Verified
PRP without proof (small exponent)
2023-07-31-Anonymous-NF-PM1
B1=40000000000, B2=169615672618692300
2021-08-01ViliamFNF-PM1
B1=500000000, B2=90500000000
2020-04-17Oliver KruseC-PRP
M6221/555190029021937960947814145119 : 14EADB5C389D4D02
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M6221/555190029021937960947814145119 : 6D965766ADC67B2E
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M6221/555190029021937960947814145119 : 6D965766ADC67B2E
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M6221/555190029021937960947814145119 : 6D965766ADC67B2E
PRP without proof (not generated)