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
1901Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
12147391823.5old
516125303928.9old
469560077027687553523760092685.3old
7110369992489714431860017294413099.2old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
60260000000105362 / 105362
6580000000068000 / 194238
Estimated T-Level: 61.8
TF below 2^200 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse9C2E54C3ACD85BD64013
Verified2017-10-02kkmrkkblmbrbk9C2E54C3ACD85BD64013
Verified2017-12-07ATH9C2E54C3ACD85BD64124813
Verified2020-04-17Oliver KruseE3459703B506D98C421253
Verified2020-08-12_p95holder_E3459703B506D98C45253
History
DateUserTypeResult
2022-12-13mikrNF-PM1
B1=400000000000, B2=2574610952249956620
2021-07-25ViliamFNF-PP1
Start=2/7, B1=1000000000, B2=221000000000
2020-08-12_p95holder_C-PRP
M1901/12147391/516125303/46956007702768755352376009/711036999248971443186001729441 : E3459703B506D98C
PRP: Verified
PRP without proof (small exponent)
2020-04-17Oliver KruseC-PRP
M1901/12147391/516125303/46956007702768755352376009/711036999248971443186001729441 : E3459703B506D98C
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M1901/12147391/516125303/46956007702768755352376009/711036999248971443186001729441 : 9C2E54C3ACD85BD6
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M1901/12147391/516125303/46956007702768755352376009/711036999248971443186001729441 : 9C2E54C3ACD85BD6
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M1901/known_factors : 9C2E54C3ACD85BD6
PRP without proof (not generated)
2016-09-07kkmrkkblmbrbkNF-PM1
B1=1000000000, B2=100000000000, E=12