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
12347
Composite, with 2 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
2666953721.3old
12877447130877456300313342908303150476939126.62019-08-08 04:45:51
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001446 / 9201
Estimated T-Level: 40.8 ⓘ
TF below 2^130 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 KruseD5F55B7E6CB85F7B1013
Factored
No proof (small exponent)
2017-10-12kkmrkkblmbrbkD5F55B7E6CB85F7B1104213
Verified
No proof (small exponent)
2019-08-08_p95holder_E4C67F57C1E9B6212283753
Verified
No proof (small exponent)
2019-08-08GANE4C67F57C1E9B6212135553
History
DateUserTypeResult
2025-03-06masserNF-PP1Start=192/17, B1=430000000, B2=429570000000
2025-02-24masserNF-PP1Start=6/5, B1=430000000, B2=429570000000
2025-01-19masserNF-PP1Start=2/7, B1=430000000, B2=429570000000
2023-04-06-anonymous-NF-PM1B1=100000000000, B2=120417199046794650
2019-08-08GANC-PRPM12347/2666953/128774471308774563003133429083031504769 : E4C67F57C1E9B621
2019-08-08_p95holder_C-PRPM12347/2666953/128774471308774563003133429083031504769 : E4C67F57C1E9B621
2019-08-08Niels_Mache_NextcloudF-ECMFactor: 128774471308774563003133429083031504769 / ECM curve 2, B1=3000000, B2=300000000, Montgomery Sigma=6739972538100468
2017-10-12kkmrkkblmbrbkC-PRPM12347/2666953 : D5F55B7E6CB85F7B
2017-09-21Oliver KruseC-PRPM12347/2666953 : D5F55B7E6CB85F7B
2017-09-21Oliver KruseC-PRPM12347/2666953 : D5F55B7E6CB85F7B
2016-09-09kkmrkkblmbrbkNF-PM1B1=100000000, B2=10000000000, E=12