Marin Mersenne 2^P-1
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MnStatusDetails
2715221Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
9158848323299916156972169.62020-08-15 18:18:20
ECM
DigitsB1Curves
255000095 / 280
Estimated T-Level: 21.7 ⓘ
TF below 2^67 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Robert FribergE86989C50534A42E0
Verified (Factored)1999-10-29Viatcheslav SapronenkoE86989C50534A42E542347
Verified (Factored)2018-08-04kkmrkkblmbrbkE86989C50534A42E806476
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-08-15megavinkCC0E9A38CA62F46A1202247653
History
DateUserTypeResult
2020-08-15ky0urakuCERT
PRP Certification
Proof certified good
2020-08-15megavinkC-PRP
M2715221/915884832329991615697 : CC0E9A38CA62F46A
PRP proof power = 7
PRP: Verified
Proof certified good
2020-08-15Brian SchroederF-ECM
Factor: 915884832329991615697 / (ECM curve 1, B1=50000, B2=5000000, Sigma=8544849721251223)
2019-02-11chuenkitNF
no factor from 2^67 to 2^68
2018-08-04kkmrkkblmbrbkC-LL
E86989C50534A42E
2017-09-29Gordon SpenceNF
no factor from 2^66 to 2^67
2016-09-22mikrNF-PM1
B1=2700000, B2=84000000, E=12
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2016-01-30ramgeisNF
no factor from 2^65 to 2^66
2015-04-13VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-13VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-10dbaughNF
no factor from 2^62 to 2^63
2012-04-25markrNF
no factor from 2^61 to 2^62
2011-04-22James HeinrichNF-PM1
B1=185000, B2=4578750, E=6
2011-01-18JossNF-PM1
B1=50000
2010-12-28JossNF-PM1
B1=30000
2010-12-19JossNF-PM1
B1=20000
2009-01-29Sturle SundeNF
no factor from 2^60 to 2^61