19 400 551 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

TF

No factors below 2⁷³

TF target 2⁶⁹

P-1

B1 =	800000
B2 =	785511090

Status	Date	User	Residue	Shift
Verified	2003-09-09	C. Cooper / S. Boone	BD86E9D7C52DE2ED	2563131
Verified	2007-08-14	Matt Perry	BD86E9D7C52DE2ED	6275926

History

Date	User	Type	Result
2022-03-20	Seth_Tr	NF-PM1	B1=800000, B2=785511090
2021-11-12	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-10-03	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-13	SRBase	NF	no factor from 2^70 to 2^71
2021-01-05	James Heinrich	NF-PM1	B1=428000, B2=26704000
2019-12-13	lycorn	NF	no factor from 2^69 to 2^70
2017-11-20	ramgeis	NF	no factor from 2^68 to 2^69
2014-04-21	Nesowa	NF	no factor from 2^67 to 2^68
2014-04-21	Nesowa	NF	no factor from 2^66 to 2^67