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
1213
Composite, with 2 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Assignments
AssignedUserWork TypeStage% DoneUpdatedEst CompleteExpired
2026-01-09ArthurECMC1S144.92 %2026-01-092026-01-11
Factored
FactorDigitsBitsDate
327511618.3old
71507984186448657279855038902524277323322301354506444504312447163208.82015-04-09 21:21:15
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
65800000000194238 / 194238
702400000000219691 / 350860
Estimated T-Level: 68.1 ⓘ
TF below 2^221 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 KruseCB46A0D10C5CCF952013
Verified
No proof (small exponent)
2017-10-09Chang Chia-TcheCB46A0D10C5CCF952013
Verified
No proof (small exponent)
2017-10-12kkmrkkblmbrbkCB46A0D10C5CCF95241413
Verified
No proof (small exponent)
2017-10-24Chang Chia-TcheCB46A0D10C5CCF95211013
Verified
No proof (small exponent)
2020-04-17Oliver Kruse23A81A82E1A64133241153
Verified
No proof (small exponent)
2020-06-08Ahmed Azhad23A81A82E1A64133281953
Verified
No proof (small exponent)
2023-06-08Valentin Mastro23A81A82E1A64133251453
History
DateUserTypeResult
2025-08-15ViliamFNF-PP1Start=6/5, B1=100000000000, B2=10000000000000
2025-06-18GeotroneVNF-ECMFactor: 327511 / ECM curve 1, B1=2400000000, B2=240000000000, Edwards Sigma=1244165684856400
2024-07-06timc995NF-PM1B1=1000000000000, B2=409821718586280
2024-05-19mindeF-ECMFactor: 327511 / ECM curve 1, B1=900000000, B2=123456789123, Edwards Sigma=2368685656707420
2024-05-18mindeF-ECMFactor: 327511 / ECM curve 1, B1=900000000, B2=321654987321, Edwards Sigma=6607321520319709
2024-04-21Joe S.NF-PM1B1=1300000000000, B2=1.3008116408141E+19
2023-06-08Valentin MastroC-PRPM1213/327511/715079841864486572798550389025242773233223013545064445043124471 : 23A81A82E1A64133
2023-04-11JacobZNF-PP1Start=6/5, B1=1000000000, B2=221000000000
2022-01-26Ethan O'ConnorNF-PM1B1=130000000, B2=82524147746040
2021-07-18ViliamFNF-PP1Start=2/7, B1=1000000000, B2=221000000000
2021-03-27nordiNF-PM1B1=1000000000000, B2=2232843418649129478
2020-09-21Wentao HuangF-ECMFactor: 327511
2020-06-08Ahmed AzhadC-PRPM1213/327511/715079841864486572798550389025242773233223013545064445043124471 : 23A81A82E1A64133
2020-04-17Oliver KruseC-PRPM1213/327511/715079841864486572798550389025242773233223013545064445043124471 : 23A81A82E1A64133
2019-03-31ANONYMOUSNF-PM1B1=20000000000, B2=2000000000000, E=12
2019-03-30ANONYMOUSNF-PM1B1=1000000, B2=100000000, E=12
2017-10-24Chang Chia-TcheC-PRPM1213/327511/715079841864486572798550389025242773233223013545064445043124471 : CB46A0D10C5CCF95
2017-10-12kkmrkkblmbrbkC-PRPM1213/327511/715079841864486572798550389025242773233223013545064445043124471 : CB46A0D10C5CCF95
2017-10-09Chang Chia-TcheC-PRPM1213/known_factors : CB46A0D10C5CCF95
2017-09-27Oliver KruseC-PRPM1213/327511/715079841864486572798550389025242773233223013545064445043124471 : CB46A0D10C5CCF95
2017-09-25csabaC-PRPM1213/known_factors : CB46A0D10C5CCF95
2016-09-10kkmrkkblmbrbkNF-PM1B1=100000000000, B2=5000000000000, E=12
2016-09-07kkmrkkblmbrbkNF-PM1B1=1000000000, B2=100000000000, E=12
2016-04-21alexF-ECMFactor: 327511
2015-12-09yatyatlingF-ECMFactor: 327511