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

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Exponent Range:










MnStatusDetails
1317223Factored
FactorDigitsBitsDate
287082015127774671241279612684.62016-10-18 19:17:25
ECM
DigitsB1Curves
2550000280 / 280
30250000105 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Joel ArmengaudCA223FBF1B649A240
Verified (Factored)Cornelius CaesarCA223FBF1B649A240
Verified (Factored)Brian J. BeesleyCA223FBF1B649A24208744
Verified (Factored)2016-06-02MadPooCA223FBF1B649A241316562
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-30Oliver KruseB76CF26DE7DFB2811013
Verified2017-10-22kkmrkkblmbrbkB76CF26DE7DFB2811131503713
History
DateUserTypeResult
2017-10-22kkmrkkblmbrbkC-PRP
M1317223/28708201512777467124127961 : B76CF26DE7DFB281
PRP: Verified
PRP without proof (not generated)
2017-09-30Oliver KruseC-PRP
M1317223/28708201512777467124127961 : B76CF26DE7DFB281
PRP: Verified
PRP without proof (not generated)
2016-10-18bamF-ECM
Factor: 28708201512777467124127961 / (ECM curve 3, B1=50000, B2=5000000)
2016-06-02MadPooC-LL
CA223FBF1B649A24
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-10-02ramgeisNF
no factor from 2^65 to 2^66
2015-04-10snme2pm1NF
no factor from 2^64 to 2^65
2015-04-10snme2pm1NF
no factor from 2^63 to 2^64
2014-06-11mikrNF-PM1
B1=4081679, B2=151022134, E=12
2013-01-07dbaughNF
no factor from 2^62 to 2^63
2012-09-18AxelssonNF
no factor from 2^61 to 2^62
2009-02-14Sturle SundeNF
no factor from 2^60 to 2^61