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

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MnStatusDetails
28817Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
112729656898687303568835420659575786891243093746149.72019-09-07 11:34:41
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000005721 / 9201
Estimated T-Level: 43.1 ⓘ
TF below 2^138 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Unknown50310
Verified (Factored)George Woltman9020C9CC88B750310
Verified (Factored)Brian J. Beesley9020C9CC88B750310
Verified (Factored)2015-04-11MadPoo9020C9CC88B7503114537
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-09-08mnd9D80AE92F1A67E00F11773553
Verified2019-09-08oodairaD80AE92F1A67E00F12231553
History
DateUserTypeResult
2024-11-23masserNF-PP1
Start=6/5, B1=100000000, B2=99900000000
2024-11-19masserNF-PP1
Start=182/11, B1=100000000, B2=99900000000
2024-11-14masserNF-PP1
Start=2/7, B1=100000000, B2=99900000000
2019-09-08oodairaC-PRP
M28817/1127296568986873035688354206595757868912430937 : D80AE92F1A67E00F
PRP: Verified
PRP without proof (small exponent)
2019-09-08mnd9C-PRP
M28817/1127296568986873035688354206595757868912430937 : D80AE92F1A67E00F
PRP: Verified
PRP without proof (small exponent)
2019-09-07Ryan PropperF-ECM
Factor: 1127296568986873035688354206595757868912430937 / (ECM curve 59, B1=43000000)
2019-07-23YxinityNF
no factor from 2^64 to 2^65
2019-07-21YxinityNF
no factor from 2^64 to 2^65
2018-04-10YxinityNF
no factor from 2^63 to 2^64
2018-04-10YxinityNF
no factor from 2^63 to 2^64
2017-06-06mikrNF-PM1
B1=12000000000, B2=960000000000, E=12
2016-09-27Sid & AndyNF
no factor from 2^62 to 2^63
2016-02-23LaurVNF
no factor from 2^57 to 2^58
2015-04-11MadPooC-LL
9020C9CC88B75031
2013-11-08David CampeauNF-PM1
B1=204535000, B2=10635820000, E=12
2012-04-02bcp19NF
no factor from 2^61 to 2^62
2012-04-02bcp19NF
no factor from 2^60 to 2^61
2009-02-09Sturle SundeNF
no factor from 2^59 to 2^60
2009-01-14Sturle SundeNF
no factor from 2^58 to 2^59