Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
20627Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
43227591371032.0old
117020317937031443.41999-04-02 00:00:00
2178429384140253276293567104684665077573328744144.02025-06-25 16:14:01
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000006145 / 9201
Estimated T-Level: 43.3
TF below 2^139 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-09-21Oliver Kruse7D1B53BF708D1E492013
Verified (Factored)2017-10-12kkmrkkblmbrbk7D1B53BF708D1E4921802713
Verified (Factored)2020-04-17Oliver Kruse33EAE35DF3D1B64D21496453
Verified (Factored)2024-07-01kkmrkkblmbrbk33EAE35DF3D1B64D21662953
Verified2025-06-25fbaur33EAE35DF3D1B64D31577853
History
DateUserTypeResult
2025-06-25fbaurC-PRP
M20627/4322759137/11702031793703/21784293841402532762935671046846650775733287 : 33EAE35DF3D1B64D
PRP: Verified
PRP without proof (small exponent)
2025-06-25fbaurF-ECM
Factor: 21784293841402532762935671046846650775733287 / (ECM curve 37, B1=43000000, B2=397298791890, Edwards Sigma=5942359975953979)
2025-02-09masserNF-PP1
Start=6/5, B1=265000000, B2=264735000000
2025-01-23masserNF-PP1
Start=195/37, B1=265000000, B2=264735000000
2025-01-13masserNF-PP1
Start=2/7, B1=265000000, B2=264735000000
2024-07-01kkmrkkblmbrbkC-PRP
M20627/11702031793703/4322759137 : 33EAE35DF3D1B64D
PRP: Verified
PRP without proof (small exponent)
2023-08-11nordiNF-PM1
B1=12000000000, B2=3601049663361150
2023-06-09nordiNF-PM1
B1=12000000000
2020-04-17Oliver KruseC-PRP
M20627/4322759137/11702031793703 : 33EAE35DF3D1B64D
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M20627/4322759137/11702031793703 : 7D1B53BF708D1E49
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M20627/4322759137/11702031793703 : 7D1B53BF708D1E49
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M20627/4322759137/11702031793703 : 7D1B53BF708D1E49
PRP without proof (not generated)
2016-11-12kkmrkkblmbrbkNF-PM1
B1=500000000, B2=10000000000, E=12
2008-08-26-Anonymous-F
Factor: 11702031793703