Marin Mersenne 2^P-1
Username
Password
Forgot password?
Blue
Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
12517Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
68176396465039242159798400784896777452255338475148158.92022-02-05 09:51:32
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000009911 / 16550
Estimated T-Level: 48.0 ⓘ
TF below 2^154 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Unknown69090
Verified (Factored)George Woltman746C9F2B1D6DE9090
Verified (Factored)Brian J. Beesley746C9F2B1D6DE9090
Verified (Factored)2015-04-11MadPoo746C9F2B1D6DE9097389
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2022-02-05SRJ2877D9232EE4B6553A731950453
Verified2022-02-12LaurVD9232EE4B6553A731305553
History
DateUserTypeResult
2023-05-13-Anonymous-NF-PM1
B1=100000000000, B2=120417199046794650
2022-02-12LaurVC-PRP
M12517/681763964650392421597984007848967774522553384751 : D9232EE4B6553A73
PRP: Verified
PRP without proof (small exponent)
2022-02-05SRJ2877C-PRP
M12517/681763964650392421597984007848967774522553384751 : D9232EE4B6553A73
PRP: Verified
PRP without proof (small exponent)
2022-02-05Ryan PropperF-ECM
Factor: 681763964650392421597984007848967774522553384751 / (ECM curve 1, B1=110000000, B2=794670076218, Sigma=13777964480828173206)
2021-10-24Ruslan BorisovNF
no factor from 2^65 to 2^66
2021-05-10ATHNF-PP1
Start=2/7, B1=1000000000, B2=241000000000
2019-03-27Anton RepkoNF
no factor from 2^64 to 2^65
2018-10-15snme2pm1NF
no factor from 2^63 to 2^64
2018-07-14James HintzNF-PM1
B1=25702202942, B2=1927665220650, E=12
2016-10-11Sid & AndyNF
no factor from 2^62 to 2^63
2016-02-23LaurVNF
no factor from 2^57 to 2^58
2015-09-14Sid & AndyNF
no factor from 2^61 to 2^62
2015-04-11MadPooC-LL
746C9F2B1D6DE909
2013-02-04bcp19NF-PM1
B1=10000000000, B2=100000000000, E=12
2012-11-22bcp19NF
no factor from 2^60 to 2^61
2012-10-12JossNF-PM1
B1=733769470
2011-05-13JossNF-PM1
B1=400000000
2010-07-11George WoltmanNF
no factor from 2^59 to 2^60
2010-07-11George WoltmanNF
no factor from 2^58 to 2^59