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

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MnStatusDetails
437557Factored
FactorDigitsBitsDate
146611857485419205416685689512993.62019-05-16 21:41:49
ECM
DigitsB1Curves
2550000280 / 280
30250000200 / 640
Estimated T-Level: 26.6 ⓘ
TF below 2^83 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski27780
Verified (Factored)Michael J. KilfoyleFDF0059CE63D27780
Verified (Factored)Eivind TrielFDF0059CE63D2778270643
Verified (Factored)2002-01-22Dennis PopeFDF0059CE63D2778410157
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-05-17francijezek7DC755C8F1C83367135522253
Verified2019-05-18Niels_Mache_Nextcloud7DC755C8F1C833671359053
History
DateUserTypeResult
2019-05-18Niels_Mache_NextcloudC-PRP
M437557/14661185748541920541668568951 : 7DC755C8F1C83367
PRP: Verified
PRP without proof (small exponent)
2019-05-17francijezekC-PRP
M437557/14661185748541920541668568951 : 7DC755C8F1C83367
PRP: Verified
PRP without proof (small exponent)
2019-05-16alexF-ECM
Factor: 14661185748541920541668568951 / (ECM curve 15, B1=250000, B2=25000000, Sigma=6986981055946219)
2018-12-13Gordon SpenceNF
no factor from 2^65 to 2^66
2017-12-21Gordon SpenceNF
no factor from 2^64 to 2^65
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-11-18Gordon SpenceNF
no factor from 2^63 to 2^64
2015-11-18Gordon SpenceNF
no factor from 2^62 to 2^63
2012-12-01dbaughNF
no factor from 2^61 to 2^62
2012-11-27dbaughNF
no factor from 2^60 to 2^61
2012-10-24markrNF-PM1
B1=20000000, B2=1000000000, E=12
2010-08-24Rob_DeeNF-PM1
B1=1000000, B2=2000000, E=6
2010-08-23Rob_DeeNF-PM1
B1=500000, B2=1000000
2009-08-27Carsten KossendeyNF-PM1
B1=437557