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
420269Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 268
TF target 244
TF below 2^98 is very unlikely to find new factors due to ECM effort.
P-1
B1 = 81000000
B2 = 1699783435350
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000330 / 1566
Estimated T-Level: 31.1 ⓘ
LL
StatusDateUserResidueShift
VerifiedDavid Slowinski71890
VerifiedAmdahl 6 - 1989001AF1890
VerifiedGuillermo Ballester ValorB9CA2235C01AF1890
VerifiedEivind TrielB9CA2235C01AF189291387
Verified2002-01-02Dennis PopeB9CA2235C01AF189241571
History
DateUserTypeResult
2023-10-10masserNF-PM1
B1=81000000, B2=1699783435350
2023-08-21JossNF-PM1
B1=20000000, B2=79026767820
2023-05-17JossNF-PM1
B1=1000000, B2=48271423200
2023-01-15JossNF-PM1
B1=1000000, B2=16747130400
2023-01-04masserNF-PP1
Start=6/5, B1=20000000, B2=640000000
2022-12-30masserNF-PP1
Start=2/7, B1=20000000, B2=640000000
2022-12-28masserNF-PP1
Start=144/71, B1=20000000, B2=620000000
2022-02-07LordJuliusNF
no factor from 2^67 to 2^68
2022-02-07LordJuliusNF
no factor from 2^66 to 2^67
2018-12-07Gordon SpenceNF
no factor from 2^65 to 2^66
2017-12-18Gordon SpenceNF
no factor from 2^64 to 2^65
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-11-13Gordon SpenceNF
no factor from 2^63 to 2^64
2015-11-13Gordon SpenceNF
no factor from 2^62 to 2^63
2015-07-15NRNF
no factor from 2^61 to 2^62
2013-01-06markrNF-PM1
B1=25000000, B2=1000000000, E=12
2011-11-12lycornNF
no factor from 2^60 to 2^61
2010-01-25BigBrotherNF-PM1
B1=2000000, B2=40000000, E=12