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

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MnStatusDetails
280871Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
271911215111134.7old
664793569911136.02008-03-05 10:59:29
1450185583693159881473651532786.92022-12-29 19:14:10
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000175 / 1566
Estimated T-Level: 30.6 ⓘ
TF below 2^97 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-09-24Oliver KruseA32D60753B9B887E2013
Verified (Factored)2017-10-13kkmrkkblmbrbkA32D60753B9B887E25340013
Verified (Factored)2020-04-17Oliver Kruse96B18A773E36FB6624699453
Verified2022-12-31LordJulius96B18A773E36FB6639615753
History
DateUserTypeResult
2024-11-08yuriy_5-1NF-PM1
B1=25840132, B2=6300646522170
2023-03-19Naegi MakotoNF-PM1
B1=2000000, B2=61940778900
2022-12-31yphysicsCERT
PRP Certification
Proof certified good
2022-12-31LordJuliusC-PRP
M280871/27191121511/66479356991/145018558369315988147365153 : 96B18A773E36FB66
PRP proof power = 5
PRP: Verified
Proof certified good
2022-12-29nordiF-ECM
Factor: 145018558369315988147365153 / (ECM curve 51, B1=250000, B2=551250000, Sigma=8549928581642142)
2022-01-03Lisander ViaeneNF-PM1
B1=100000
2020-04-17Oliver KruseC-PRP
M280871/27191121511/66479356991 : 96B18A773E36FB66
PRP: Verified (Factored)
PRP without proof (small exponent)
2017-10-13kkmrkkblmbrbkC-PRP
M280871/27191121511/66479356991 : A32D60753B9B887E
PRP: Verified (Factored)
PRP without proof (small exponent)
2017-09-24Oliver KruseC-PRP
M280871/27191121511/66479356991 : A32D60753B9B887E
PRP: Verified (Factored)
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M280871/27191121511/66479356991 : A32D60753B9B887E
PRP without proof (not generated)