Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
12889
Composite, with 3 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
203826647927.6old
14225602549158135890870633268179436136116.82012-08-18 23:00:18
66243648548022638327141704470737052838223436145148.92023-05-15 09:14:53
P-1 factors
DateFactorsB1B2
2023-05-27No new factors discovered100000000000120417199046794656
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001868 / 9201
Estimated T-Level: 41.0 ⓘ
TF below 2^131 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
No proof (small exponent)
2017-09-21Oliver KruseA1836846BA0431B82013
Factored
No proof (small exponent)
2017-10-02kkmrkkblmbrbkA1836846BA0431B82013
Factored
No proof (small exponent)
2017-12-07ATHA1836846BA0431B82351613
Factored
No proof (small exponent)
2020-04-17Oliver KruseF4185ACB3F3F6CE12401453
Verified
No proof (small exponent)
2023-05-15JacobZF4185ACB3F3F6CE13424453
Verified
No proof (small exponent)
2023-05-15retsuF4185ACB3F3F6CE13290053
History
DateUserTypeResult
2025-03-03masserNF-PP1Start=111/37, B1=430000000, B2=429570000000
2025-02-16masserNF-PP1Start=6/5, B1=430000000, B2=429570000000
2025-01-16masserNF-PP1Start=2/7, B1=430000000, B2=429570000000
2023-05-27-anonymous-F-PM1Factor: 662436485480226383271417044707370528382234361 / B1=100000000000, B2=120417199046794650
2023-05-15retsuC-PRPM12889/203826647/142256025491581358908706332681794361/662436485480226383271417044707370528382234361 : F4185ACB3F3F6CE1
2023-05-15JacobZC-PRPM12889/203826647/142256025491581358908706332681794361/662436485480226383271417044707370528382234361 : F4185ACB3F3F6CE1
2023-05-15JacobZF-PM1Factor: 662436485480226383271417044707370528382234361 / B1=8600000000, B2=36024966470342850
2022-02-05JossNF-PM1B1=1000000, B2=3910366209750
2020-04-17Oliver KruseC-PRPM12889/203826647/142256025491581358908706332681794361 : F4185ACB3F3F6CE1
2017-12-07ATHC-PRPM12889/203826647/142256025491581358908706332681794361 : A1836846BA0431B8
2017-10-02kkmrkkblmbrbkC-PRPM12889/203826647/142256025491581358908706332681794361 : A1836846BA0431B8
2017-09-21Oliver KruseC-PRPM12889/203826647/142256025491581358908706332681794361 : A1836846BA0431B8
2017-09-21Oliver KruseC-PRPM12889/203826647/142256025491581358908706332681794361 : A1836846BA0431B8
2012-08-18BloodIceF-ECMFactor: 142256025491581358908706332681794361