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
2551Composite, with 5 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
393707513591135.2old
3160515265114391548.2old
24688413891363911651.1old
7848457846085946411859.4old
4450262669635885914778792478.6old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
504400000016550 / 16550
5511000000040830 / 40830
6026000000020503 / 105362
Estimated T-Level: 56.0
TF below 2^181 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse22A1FFCBD23C41D35013
Verified2017-10-02kkmrkkblmbrbk22A1FFCBD23C41D35013
Verified2017-12-07ATH22A1FFCBD23C41D35176913
Verified2020-04-17Oliver KruseFD1679C0F9E080AD5114153
Verified2024-02-03Wentao HuangFD1679C0F9E080AD521753
History
DateUserTypeResult
2024-05-26masserNF-PM1
B1=100000000000, B2=284073348859550250
2024-02-03Wentao HuangC-PRP
M2551/39370751359/316051526511439/2468841389136391/784845784608594641/445026266963588591477879 : FD1679C0F9E080AD
PRP: Verified
PRP without proof (small exponent)
2021-07-05ViliamFNF-PM1
B1=1000000000, B2=191000000000
2020-04-17Oliver KruseC-PRP
M2551/39370751359/316051526511439/2468841389136391/784845784608594641/445026266963588591477879 : FD1679C0F9E080AD
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M2551/39370751359/316051526511439/2468841389136391/784845784608594641/445026266963588591477879 : 22A1FFCBD23C41D3
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M2551/39370751359/316051526511439/2468841389136391/784845784608594641/445026266963588591477879 : 22A1FFCBD23C41D3
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M2551/known_factors : 22A1FFCBD23C41D3
PRP without proof (not generated)