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

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MnStatusDetails
11905081Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
1619128501178260073127292477.12019-04-05 00:45:09
ECM
DigitsB1Curves
255000015 / 280
Estimated T-Level: 20.3 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2001-11-10Nathan StohsD450444DE58C23B68059379
Verified (Factored)2004-10-18Brian JueD450444DE58C23B61455122
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-04-05riccardo ubertiB0932C282D84B39E1618833053
Verified2021-02-16JaytholomewB0932C282D84B39E1892574453
P-1 factors
DateFactorB1B2
2019-04-051619128501178260073127294300008500000
History
DateUserTypeResult
2023-05-11nordiNF-PM1
B1=400000, B2=428459850
2021-11-12riccardo ubertiNF-PM1
B1=1500000, B2=30000000
2021-02-16Ben DeloCERT
PRP Certification
Proof certified good
2021-02-16JaytholomewC-PRP
M11905081/161912850117826007312729 : B0932C282D84B39E
PRP proof power = 8
PRP: Verified
Proof certified good
2019-04-05riccardo ubertiC-PRP
M11905081/161912850117826007312729 : B0932C282D84B39E
PRP: Verified
PRP without proof (not generated)
2019-04-05riccardo ubertiF-PM1
Factor: 161912850117826007312729 / (P-1, B1=430000, B2=8500000, E=12)
2017-12-29ramgeisNF
no factor from 2^68 to 2^69
2017-12-29ramgeisNF
no factor from 2^67 to 2^68
2016-02-14YxinityNF
no factor from 2^66 to 2^67
2013-10-31NesowaNF
no factor from 2^65 to 2^66
2013-10-21lycornNF
no factor from 2^64 to 2^65