Marin Mersenne 2^P-1
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MnStatusDetails
7171387Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
6638249358208696915212169.22017-10-26 05:51:17
ECM
DigitsB1Curves
25500004 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Bad1999-06-15Rob Gill7B1EFED29F26A9643205701
Verified (Factored)2002-05-11Joris van Rantwijk0C7BF01E4C1E28DA2883044
Verified (Factored)2002-06-29Stuart Bugge0C7BF01E4C1E28DA5872823
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2018-02-16Oliver Kruse39F3313AA41EA2061683052153
Verified2019-03-30kkmrkkblmbrbk39F3313AA41EA2061382074353
History
DateUserTypeResult
2019-03-30kkmrkkblmbrbkC-PRP
M7171387/663824935820869691521 : 39F3313AA41EA206
PRP: Verified
PRP without proof (not generated)
2018-02-16Oliver KruseC-PRP
M7171387/663824935820869691521 : 39F3313AA41EA206
PRP: Verified
PRP without proof (not generated)
2017-10-26mpickeringF-ECM
Factor: 663824935820869691521 / (ECM curve 1, B1=50000, B2=5000000)
2016-10-26Gordon SpenceNF
no factor from 2^66 to 2^67
2015-06-21VictordeHollanderNF
no factor from 2^65 to 2^66
2014-02-05lycornNF
no factor from 2^64 to 2^65
2014-02-02NesowaNF
no factor from 2^63 to 2^64
2012-01-10Carsten KossendeyNF-PM1
B1=455000, B2=13991250, E=12