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
1259
Composite, with 2 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
8759659659041531549.6old
1283780190326041865922250218027136896917279020999921083156183.12014-05-21 01:53:51
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
6580000000084383 / 194238
Estimated T-Level: 62.2 ⓘ
TF below 2^202 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 KruseEBCA1555A98ECAF72013
Verified
No proof (small exponent)
2017-10-09Chang Chia-TcheEBCA1555A98ECAF72013
Verified
No proof (small exponent)
2017-10-12kkmrkkblmbrbkEBCA1555A98ECAF7279313
Verified
No proof (small exponent)
2020-04-17Oliver KruseE62CA18111138404267253
Verified
No proof (small exponent)
2020-08-12_p95holder_E62CA18111138404275753
History
DateUserTypeResult
2025-09-26ViliamFNF-PP1Start=6/5, B1=50000000000, B2=5000000000000
2025-09-22ViliamFNF-PP1Start=2/7, B1=50000000000, B2=5000000000000
2021-07-19ViliamFNF-PP1Start=2/7, B1=1000000000, B2=221000000000
2021-03-27nordiNF-PM1B1=1000000000000, B2=2232843418649129478
2020-08-12_p95holder_C-PRPM1259/875965965904153/12837801903260418659222502180271368969172790209999210831 : E62CA18111138404
2020-04-17Oliver KruseC-PRPM1259/875965965904153/12837801903260418659222502180271368969172790209999210831 : E62CA18111138404
2017-10-12kkmrkkblmbrbkC-PRPM1259/875965965904153/12837801903260418659222502180271368969172790209999210831 : EBCA1555A98ECAF7
2017-10-09Chang Chia-TcheC-PRPM1259/known_factors : EBCA1555A98ECAF7
2017-09-27Oliver KruseC-PRPM1259/875965965904153/12837801903260418659222502180271368969172790209999210831 : EBCA1555A98ECAF7
2017-09-25csabaC-PRPM1259/known_factors : EBCA1555A98ECAF7
2016-09-07kkmrkkblmbrbkNF-PM1B1=1000000000, B2=100000000000, E=12
2014-05-21-anonymous-F-ECMFactor: 12837801903260418659222502180271368969172790209999210831
2009-10-25Carsten KossendeyFFactor: 875965965904153
2005-01-20-anonymous-FFactor: 875965965904153