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
37958731
Composite: proven not-prime with Lucas-Lehmer test
No factors below 274
TF target 271
P-1
B1 = 840000
B2 = 21000000
LL
StatusDateUserResidueShiftSoftware
Verified2008-06-22C. Cooper / S. BooneF79442497A2A278F14504943Windows,Prime95,v24 final,NT service,(aka Wc5)
Verified2016-10-31DubslowF79442497A2A278F33374451Linux 64-bit,Prime95,v28.7,build 1
History
DateUserTypeResult
2016-10-31DubslowC-LLF79442497A2A278F
2016-10-25Bruno VictalNF-PM1B1=840000, B2=21000000, E=12
2016-10-24Bruno VictalNFno factor TF: 73-74
2016-10-24Bruno VictalNFno factor TF: 72-73
2016-10-24Bruno VictalNFno factor TF: 71-72
2016-04-26HBendtzNF-PM1B1=400000, B2=12000000, E=12
2014-04-04Jerry HallettNFno factor TF: 70-71
2014-04-04Jerry HallettNFno factor TF: 69-70
2008-06-22curtiscC-LLF79442497A2A278F
2007-07-04-anonymous-NF-PM1B1=545000
2006-06-13ahmeraliNFno factor TF: 1-69