Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
6481
Composite, with 6 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 244
Factored
FactorDigitsBitsDate
622177619.2old
2799793721.4old
38678609825.2old
8754477467188266538549967326812732106.1old
882114163848571825209273550078574787137122.7old
1471890350756935520504990066975660102040458498104761016756183.32021-06-12 13:47:56
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000002794 / 16550
Estimated T-Level: 45.8 ⓘ
TF below 2^147 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 Kruse82C2F028294EB17C5013
Factored
No proof (small exponent)
2017-10-02kkmrkkblmbrbk82C2F028294EB17C5013
Factored
No proof (small exponent)
2017-12-07ATH82C2F028294EB17C5216513
Factored
No proof (small exponent)
2020-04-17Oliver KruseF093F99E2223BB745325953
Verified
No proof (small exponent)
2021-06-12mikrF093F99E2223BB746637853
History
DateUserTypeResult
2025-03-20masserNF-PP1Start=138/11, B1=1000000000, B2=999000000000
2025-03-12masserNF-PP1Start=6/5, B1=1000000000, B2=999000000000
2025-03-03masserNF-PP1Start=2/7, B1=1000000000, B2=999000000000
2023-08-07-anonymous-NF-PM1B1=38000000000, B2=159095079570076650
2021-08-27Seth_TrNF-PM1B1=400000000
2021-06-12mikrC-PRPM6481/622177/2799793/38678609/87544774671882665385499673268127/8821141638485718252092735500785747871/14718903507569355205049900669756601020404584981047610167 : F093F99E2223BB74
2021-06-12Ryan PropperF-ECMFactor: 14718903507569355205049900669756601020404584981047610167
2020-04-17Oliver KruseC-PRPM6481/622177/2799793/38678609/87544774671882665385499673268127/8821141638485718252092735500785747871 : F093F99E2223BB74
2017-12-07ATHC-PRPM6481/622177/2799793/38678609/87544774671882665385499673268127/8821141638485718252092735500785747871 : 82C2F028294EB17C
2017-10-02kkmrkkblmbrbkC-PRPM6481/622177/2799793/38678609/87544774671882665385499673268127/8821141638485718252092735500785747871 : 82C2F028294EB17C
2017-09-21Oliver KruseC-PRPM6481/known_factors : 82C2F028294EB17C