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

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MnStatusDetails
4417321Factored
FactorDigitsBitsDate
7784663072368204249815432479.42019-08-31 04:58:33
ECM
DigitsB1Curves
255000010 / 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)1998-04-21Ian Pattle28B0ACB64FCD35DD0
Verified (Factored)2000-01-04Tom Mossberg28B0ACB64FCD35DD3098697
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-08-31Niels_Mache_Nextcloud6767F0440C88A73A165574053
Verified2019-09-05Chang Chia-Tche6767F0440C88A73A118431453
History
DateUserTypeResult
2019-09-05Chang Chia-TcheC-PRP
M4417321/778466307236820424981543 : 6767F0440C88A73A
PRP: Verified
PRP without proof (not generated)
2019-08-31Niels_Mache_NextcloudC-PRP
M4417321/778466307236820424981543 : 6767F0440C88A73A
PRP: Verified
PRP without proof (not generated)
2019-08-31CoreyF-ECM
Factor: 778466307236820424981543 / (ECM curve 1, B1=50000, B2=5000000)
2018-06-23ramgeisNF
no factor from 2^67 to 2^68
2018-05-14Gordon SpenceNF
no factor from 2^66 to 2^67
2016-08-27mikrNF-PM1
B1=1800000, B2=68000000, E=12
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-06-22snme2pm1NF
no factor from 2^65 to 2^66
2014-08-29lycornNF
no factor from 2^64 to 2^65
2014-08-26JayderNF
no factor from 2^63 to 2^64
2012-03-31Squeeky_SquirrelNF-PM1
B1=135000, B2=2733750, E=6
2012-02-03GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-10-27markrNF
no factor from 2^61 to 2^62
2009-07-18Carsten KossendeyNF-PM1
B1=25000, B2=356250