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

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MnStatusDetails
420421Factored
FactorDigitsBitsDate
2138583578558798640910073772787.52019-05-02 20:19:59
ECM
DigitsB1Curves
2550000280 / 280
30250000322 / 640
Estimated T-Level: 27.5 ⓘ
TF below 2^86 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski4F610
Verified (Factored)Amdahl 6 - 198936DB4F610
Verified (Factored)Guillermo Ballester Valor2728369BF6DB4F610
Verified (Factored)Eivind Triel2728369BF6DB4F61210624
Verified (Factored)2002-01-02Dennis Pope2728369BF6DB4F61190041
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-05-03matzetoniFFE2FFBCE3E9EB8C138887953
Verified2019-05-05Chang Chia-TcheFFE2FFBCE3E9EB8C114137153
History
DateUserTypeResult
2019-05-05Chang Chia-TcheC-PRP
M420421/213858357855879864091007377 : FFE2FFBCE3E9EB8C
PRP: Verified
PRP without proof (small exponent)
2019-05-03matzetoniC-PRP
M420421/213858357855879864091007377 : FFE2FFBCE3E9EB8C
PRP: Verified
PRP without proof (small exponent)
2019-05-02alexF-ECM
Factor: 213858357855879864091007377 / (ECM curve 206, B1=250000, B2=25000000, Sigma=1072757195502674)
2018-12-07Gordon SpenceNF
no factor from 2^65 to 2^66
2017-12-18Gordon SpenceNF
no factor from 2^64 to 2^65
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-11-13Gordon SpenceNF
no factor from 2^63 to 2^64
2015-11-13Gordon SpenceNF
no factor from 2^62 to 2^63
2015-07-15NRNF
no factor from 2^61 to 2^62
2013-01-06markrNF-PM1
B1=25000000, B2=1000000000, E=12
2011-11-11lycornNF
no factor from 2^60 to 2^61
2010-01-25BigBrotherNF-PM1
B1=2000000, B2=40000000, E=12