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

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MnStatusDetails
21191557Composite: proven not-prime with Lucas-Lehmer test
TF
No factors below 273
TF target 269
P-1
B1 = 1200000
B2 = 1494581550
LL
StatusDateUserResidueShift
Verified2004-03-08C. Cooper / S. Boone6E5BED9CF8FA26CF20195889
Verified2008-09-24Ars Technica Team Prime Rib6E5BED9CF8FA26CF15456588
History
DateUserTypeResult
2025-02-28ThaNF-PM1
B1=1200000, B2=1494581550
2020-12-31-Anonymous-NF
no factor from 2^72 to 2^73
2020-12-29-Anonymous-NF
no factor from 2^71 to 2^72
2020-12-29-Anonymous-NF
no factor from 2^70 to 2^71
2018-04-15ramgeisNF
no factor from 2^69 to 2^70
2017-12-11VictordeHollanderNF
no factor from 2^68 to 2^69
2017-04-23ramgeisNF
no factor from 2^67 to 2^68
2015-04-17NRNF
no factor from 2^66 to 2^67