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
9281
Composite, with 4 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
100213432168091443.2old
695886185108571446.0old
2153113715066261271857.6old
701499937806886348146792375.9old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000006824 / 16550
Estimated T-Level: 47.1 ⓘ
TF below 2^151 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Verified
No proof (small exponent)
2017-09-21Oliver KruseB06B42C4B2A22A634013
Verified
No proof (small exponent)
2017-10-02kkmrkkblmbrbkB06B42C4B2A22A634013
Verified
No proof (small exponent)
2017-12-07ATHB06B42C4B2A22A634703413
Verified
No proof (small exponent)
2020-04-17Oliver Kruse9B0E1E978CDA4AF84502453
Verified
No proof (small exponent)
2024-07-01kkmrkkblmbrbk9B0E1E978CDA4AF84834053
History
DateUserTypeResult
2025-04-08masserNF-PP1Start=121/41, B1=1000000000, B2=999000000000
2024-07-01kkmrkkblmbrbkC-PRPM9281/10021343216809/215311371506626127/69588618510857/70149993780688634814679 : 9B0E1E978CDA4AF8
2023-07-08JacobZNF-PM1B1=62000000000, B2=254047854677867250
2022-01-03ANONYMOUSNF-PM1B1=100000000, B2=30501691119900
2022-01-03ANONYMOUSNF-PM1B1=10000000, B2=2551968529110
2020-04-17Oliver KruseC-PRPM9281/10021343216809/69588618510857/215311371506626127/70149993780688634814679 : 9B0E1E978CDA4AF8
2017-12-07ATHC-PRPM9281/10021343216809/69588618510857/215311371506626127/70149993780688634814679 : B06B42C4B2A22A63
2017-10-02kkmrkkblmbrbkC-PRPM9281/10021343216809/69588618510857/215311371506626127/70149993780688634814679 : B06B42C4B2A22A63
2017-09-21Oliver KruseC-PRPM9281/known_factors : B06B42C4B2A22A63
2009-03-02kiwiboyF-PM1Factor: 697371430080886011671395313