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

PrimeNet Exponent Status

Exponent Range:





MnDetails
1229
Composite, with 4 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
36871515.2old
46703515.5old
105431792806619161210332373.2old
953628935531439257999607151516058309829861668603308585755182.62014-01-14 19:52:09
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
65800000000105082 / 194238
Estimated T-Level: 62.7 ⓘ
TF below 2^203 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
No proof (small exponent)
2017-09-27Oliver KruseABD7D71DF12816664013
Verified
No proof (small exponent)
2017-10-09Chang Chia-TcheABD7D71DF12816664013
Verified
No proof (small exponent)
2017-10-12kkmrkkblmbrbkABD7D71DF1281666446113
Verified
No proof (small exponent)
2020-04-17Oliver KruseE7FC22FC9F6ACC35445053
Verified
No proof (small exponent)
2020-08-12_p95holder_E7FC22FC9F6ACC35499053
History
DateUserTypeResult
2025-09-02ViliamFNF-PP1Start=6/5, B1=50000000000, B2=5000000000000
2025-08-31ViliamFNF-PP1Start=2/7, B1=50000000000, B2=5000000000000
2024-05-09Joe S.NF-PM1B1=1300000000000, B2=1.3003635092095E+19
2021-07-19ViliamFNF-PP1Start=2/7, B1=1000000000, B2=221000000000
2021-03-27nordiNF-PM1B1=1000000000000, B2=2232843418649129478
2020-08-12_p95holder_C-PRPM1229/36871/46703/10543179280661916121033/9536289355314392579996071515160583098298616686033085857 : E7FC22FC9F6ACC35
2020-04-17Oliver KruseC-PRPM1229/36871/46703/10543179280661916121033/9536289355314392579996071515160583098298616686033085857 : E7FC22FC9F6ACC35
2017-10-12kkmrkkblmbrbkC-PRPM1229/36871/46703/10543179280661916121033/9536289355314392579996071515160583098298616686033085857 : ABD7D71DF1281666
2017-10-09Chang Chia-TcheC-PRPM1229/known_factors : ABD7D71DF1281666
2017-09-27Oliver KruseC-PRPM1229/36871/46703/10543179280661916121033/9536289355314392579996071515160583098298616686033085857 : ABD7D71DF1281666
2017-09-25csabaC-PRPM1229/known_factors : ABD7D71DF1281666
2016-09-07kkmrkkblmbrbkNF-PM1B1=1000000000, B2=100000000000, E=12
2014-01-14-anonymous-F-ECMFactor: 9536289355314392579996071515160583098298616686033085857
2005-01-10-anonymous-FFactor: 10543179280661916121033