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:





MnDetails
42391309
Composite: proven not-prime with Lucas-Lehmer test
No factors below 274
TF target 272
P-1
B1 = 505000
B2 = 13635000
LL
StatusDateUserResidueShiftSoftware
Bad2008-05-10Neil Kirkland3590D5F3CB09EDE032590589Windows,Prime95,v24 final,(aka Wc1)
Verified2015-10-09George Woltman4E001B2739854B0029218100Mac OS X 64-bit,Prime95,v28.7,build 1
Verified2016-09-16Mark Rose4E001B2739854B001245131Linux 64-bit,Prime95,v28.9,build 2
History
DateUserTypeResult
2020-01-10-anonymous-NFno factor TF: 73-74
2019-10-04-anonymous-NFno factor TF: 72-73
2016-09-16Mark RoseC-LL4E001B2739854B00
2015-10-09George WoltmanC-LL4E001B2739854B00
2015-07-28GregNFno factor TF: 71-72
2015-03-25Mark RoseNFno factor TF: 70-71
2015-02-07chalsallNFno factor TF: 69-70
2014-03-04LaurVNFno factor TF: 68-69
2008-05-10-anonymous-C-LL3590D5F3CB09EDE0
2008-03-22-anonymous-NF-PM1B1=505000, B2=13635000
2007-07-24tscNFno factor TF: 1-68