Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
1621861Factored
FactorDigitsBitsDate
754253878678744359887772376.02016-03-26 22:46:59
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Gordon M. SpenceBC3AEE873D158B570
Verified (Factored)1998-11-14David CampeauBC3AEE873D158B57216162
Verified (Factored)2015-07-19MadPooBC3AEE873D158B57677665
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-02Oliver Kruse1DECA73053D4C4591013
Verified2017-11-01kkmrkkblmbrbk1DECA73053D4C459139274913
History
DateUserTypeResult
2017-11-01kkmrkkblmbrbkC-PRP
M1621861/75425387867874435988777 : 1DECA73053D4C459
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1621861/75425387867874435988777 : 1DECA73053D4C459
PRP: Verified
PRP without proof (not generated)
2016-03-26bamF-ECM
Factor: 75425387867874435988777 / (ECM curve 2, B1=50000, B2=5000000)
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-10-11ramgeisNF
no factor from 2^65 to 2^66
2015-07-19MadPooC-LL
BC3AEE873D158B57
2015-04-30monstNF
no factor from 2^64 to 2^65
2015-04-29omylistNF
no factor from 2^63 to 2^64
2011-11-29BigBrotherNF-PM1
B1=1000000, B2=20000000, E=12
2010-08-13GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-05-03Architects CubedNF
no factor from 2^60 to 2^61