Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
6467821Factored
FactorDigitsBitsDate
66630324593443900056704412582.52022-08-03 20:12:46
ECM
DigitsB1Curves
25500006 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1999-11-04C. Cooper / S. Boone3BE8CBBD5C697E546001694
Verified (Factored)2001-04-01Michael Taylor3BE8CBBD5C697E544365122
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2022-08-10LordJulius7DED49BAE35CC76E1384707353
P-1 factors
DateFactorB1B2
2022-08-036663032459344390005670441250000050028510
History
DateUserTypeResult
2022-08-10curtiscCERT
PRP Certification
Proof certified good
2022-08-10LordJuliusC-PRP
M6467821/6663032459344390005670441 : 7DED49BAE35CC76E
PRP proof power = 7
PRP: Verified
Proof certified good
2022-08-03takahashiF-PM1
Factor: 6663032459344390005670441 / (P-1, B1=2500000, B2=50028510)
2021-09-21SRBaseNF
no factor from 2^71 to 2^72
2021-08-10SRBaseNF
no factor from 2^70 to 2^71
2021-03-14takahashiNF
no factor from 2^69 to 2^70
2020-05-23takahashiNF
no factor from 2^68 to 2^69
2018-06-06ramgeisNF
no factor from 2^67 to 2^68
2016-04-10Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-10-25snme2pm1NF
no factor from 2^65 to 2^66
2014-09-07NesowaNF-PM1
B1=395000, B2=9973750, E=12
2014-08-08lycornNF
no factor from 2^64 to 2^65
2014-08-02NesowaNF
no factor from 2^63 to 2^64