19 227 227 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 =	3101000
B2 =	12436383960

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2003-09-09	C. Cooper / S. Boone	6E1DCE29F10EED22	17526114
Verified	2007-05-28	Colin Archibald	6E1DCE29F10EED22	1762449

History

Date	User	Type	Result
2024-11-08	Jason Lynch	NF-PM1	B1=3101000, B2=12436383960
2021-11-19	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-10-01	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-12	SRBase	NF	no factor from 2^70 to 2^71
2021-05-30	Dylan Delgado	NF-PM1	B1=1000000, B2=25000000, e=12
2020-11-03	James Heinrich	NF-PM1	B1=396000, B2=13711000, E=12
2020-10-31	James Heinrich	NF-PM1	B1=396000, B2=13711000, E=12
2019-12-27	lycorn	NF	no factor from 2^69 to 2^70
2017-11-20	ramgeis	NF	no factor from 2^68 to 2^69
2014-06-15	Nesowa	NF	no factor from 2^67 to 2^68
2014-06-15	Nesowa	NF	no factor from 2^66 to 2^67