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

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MnStatusDetails
3971749Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
131031503058513493717983113772993.42022-05-12 07:54:35
ECM
DigitsB1Curves
255000019 / 280
Estimated T-Level: 20.3 ⓘ
TF below 2^63 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-09-20Dalos LeeEE058FF9D082065D0
Verified (Factored)1999-09-07Carl MikkelsenEE058FF9D082065D3121423
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2022-05-13aperson1F3E543530A89651F137196953
P-1 factors
DateFactorB1B2
2022-05-1213103150305851349371798311377500000113097600
History
DateUserTypeResult
2022-10-01JossNF-PM1
B1=1000000, B2=113097600
2022-05-13MathEnthousiastCERT
PRP Certification
Proof certified good
2022-05-13aperson1C-PRP
M3971749/13103150305851349371798311377 : F3E543530A89651F
PRP proof power = 7
PRP: Verified
Proof certified good
2022-05-12JossF-PM1
Factor: 13103150305851349371798311377 / (P-1, B1=500000, B2=113097600)
2021-06-02-Anonymous-NF
no factor from 2^70 to 2^71
2021-05-11axnNF
no factor from 2^69 to 2^70
2020-05-29TJAOINF
no factor from 2^68 to 2^69
2018-12-29YxinityNF
no factor from 2^67 to 2^68
2016-12-15Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-04ramgeisNF
no factor from 2^65 to 2^66
2013-10-19David CampeauNF
no factor from 2^64 to 2^65
2013-06-30JayderNF
no factor from 2^63 to 2^64
2012-02-20GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-04-30markrNF
no factor from 2^61 to 2^62
2011-04-26Carsten KossendeyNF-PM1
B1=265000, B2=7618750, E=12
2009-07-27Carsten KossendeyNF-PM1
B1=20000, B2=285000