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

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MnStatusDetails
3207289Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
646996928274615039132065.82015-06-21 21:40:17
ECM
DigitsB1Curves
25500009 / 280
Estimated T-Level: 20.2 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Skip Zogopoulos924E4E462149117B0
Verified (Factored)1999-09-14Gerhard H Wrodnigg924E4E462149117B280952
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-30alpertron08B9C355CE36DC801013
Verified2017-11-19Oliver Kruse08B9C355CE36DC801156023613
History
DateUserTypeResult
2022-04-04LordJuliusNF
no factor from 2^66 to 2^67
2022-02-07JossNF-PM1
B1=1000000, B2=119912100
2021-05-11JossNF
no factor from 2^67 to 2^68
2020-12-28JossNF-PM1
B1=320728, B2=3207289, E=6
2017-11-19Oliver KruseC-PRP
M3207289/64699692827461503913 : 08B9C355CE36DC80
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M3207289/64699692827461503913 : 08B9C355CE36DC80
PRP: Verified
PRP without proof (not generated)
2015-06-21ThaF
Factor: 64699692827461503913 / TF: 65-66
2015-02-15VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-15VictordeHollanderNF
no factor from 2^63 to 2^64
2014-11-06JossNF-PM1
B1=105560
2014-08-21JossNF-PM1
B1=85548
2013-01-03dbaughNF
no factor from 2^62 to 2^63
2011-07-04markrNF
no factor from 2^61 to 2^62
2009-04-07S485122NF
no factor from 2^60 to 2^61