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:










MnStatusDetails
1249Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
97423516.6old
52358081825.6old
23790052731031.1old
93452760459072727263640124812892.9old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
6580000000076829 / 194238
Estimated T-Level: 62.0
TF below 2^201 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-27Oliver KruseFBF2F4174247085D4013
Verified2017-10-09Chang Chia-TcheFBF2F4174247085D4013
Verified2017-10-12kkmrkkblmbrbkFBF2F4174247085D411913
Verified2020-04-17Oliver KruseCE1166266BB625B0495553
Verified2020-08-12_p95holder_CE1166266BB625B0419453
History
DateUserTypeResult
2021-07-19ViliamFNF-PP1
Start=2/7, B1=1000000000, B2=221000000000
2021-03-27nordiNF-PM1
B1=1000000000000, B2=2232843418649129478
2020-08-12_p95holder_C-PRP
M1249/97423/52358081/2379005273/9345276045907272726364012481 : CE1166266BB625B0
PRP: Verified
PRP without proof (small exponent)
2020-04-17Oliver KruseC-PRP
M1249/97423/52358081/2379005273/9345276045907272726364012481 : CE1166266BB625B0
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M1249/97423/52358081/2379005273/9345276045907272726364012481 : FBF2F4174247085D
PRP: Verified
PRP without proof (not generated)
2017-10-09Chang Chia-TcheC-PRP
M1249/known_factors : FBF2F4174247085D
PRP: Verified
PRP without proof (not generated)
2017-09-27Oliver KruseC-PRP
M1249/97423/52358081/2379005273/9345276045907272726364012481 : FBF2F4174247085D
PRP: Verified
PRP without proof (not generated)
2017-09-25csabaC-PRP
M1249/known_factors : FBF2F4174247085D
PRP without proof (not generated)
2016-09-07kkmrkkblmbrbkNF-PM1
B1=1000000000, B2=100000000000, E=12