Marin Mersenne 2^P-1
Username
Password
Forgot password?
Black
Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:





MnDetails
42393961
Composite: proven not-prime with Lucas-Lehmer test
No factors below 274
TF target 272
P-1
B1 = 490000
B2 = 13107500
LL
StatusDateUserResidueShiftSoftware
Bad2008-04-2518alexfyxodefB8DE47CCAC6A1A3E33272157Windows,Prime95,v25 beta,(aka Wd1)
Verified2016-08-04kkmrkkblmbrbk850B113D130634EA13775991Linux 64-bit,Prime95,v28.9,build 2
Verified2016-09-18Mark Rose850B113D130634EA11160420Linux 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
2016-09-18Mark RoseC-LL850B113D130634EA
2016-08-04kkmrkkblmbrbkC-LL850B113D130634EA
2015-08-17Sid & AndyNFno factor TF: 71-72
2015-03-08Mark RoseNFno factor TF: 70-71
2015-02-07chalsallNFno factor TF: 69-70
2008-04-24-anonymous-C-LLB8DE47CCAC6A1A3E
2008-03-22-anonymous-NF-PM1B1=490000, B2=13107500, E=6
2007-06-15MarzbugNFno factor TF: 1-69