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

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MnStatusDetails
395189Factored
FactorDigitsBitsDate
21262553298349770303595979112890.82019-04-17 01:51:27
ECM
DigitsB1Curves
2550000280 / 280
30250000436 / 640
Estimated T-Level: 28.4 ⓘ
TF below 2^89 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski14B0
Verified (Factored)Bo Asklund3A951E3BF19C814B0
Verified (Factored)Klaus Kastens3A951E3BF19C814B0
Verified (Factored)Eivind Triel3A951E3BF19C814B319903
Verified (Factored)2016-06-01MadPoo3A951E3BF19C814B148788
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-04-17artorolloAB28176BE8332906139323153
Verified2019-04-18marssystemsAB28176BE8332906128555953
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2019-04-30Gordon SpenceNF
no factor from 2^65 to 2^66
2019-04-18marssystemsC-PRP
M395189/2126255329834977030359597911 : AB28176BE8332906
PRP: Verified
PRP without proof (small exponent)
2019-04-17artorolloC-PRP
M395189/2126255329834977030359597911 : AB28176BE8332906
PRP: Verified
PRP without proof (small exponent)
2019-04-17alexF-ECM
Factor: 2126255329834977030359597911 / (ECM curve 186, B1=250000, B2=25000000, Sigma=1241872161317497)
2018-01-18BloodERazorNF
no factor from 2^64 to 2^65
2017-01-24mikrNF-PM1
B1=60000000, B2=3000000000, E=12
2016-06-01MadPooC-LL
3A951E3BF19C814B
2015-11-19Gordon SpenceNF
no factor from 2^63 to 2^64
2015-11-19Gordon SpenceNF
no factor from 2^62 to 2^63
2015-08-25NRNF
no factor from 2^61 to 2^62
2012-07-05alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2011-02-27monstNF
no factor from 2^60 to 2^61
2009-01-27Sturle SundeNF
no factor from 2^59 to 2^60
2009-01-05Sturle SundeNF
no factor from 2^58 to 2^59