42 019 361 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
6438889628521674842569	22	72.4	2019-04-20 05:37:50

Status	Date	User	Residue	Shift
Verified (Factored)	2009-05-07	Tom Mueller	8D78F6D81804953B	3864660
Verified (Factored)	2016-10-08	ANONYMOUS	8D78F6D81804953B	25876184

History

Date	User	Type	Result
2019-04-20	Conductor	F	Factor: 6438889628521674842569 / TF: 72-73
2016-10-08	ANONYMOUS	C-LL	8D78F6D81804953B
2015-09-13	AirSquirrels	NF	no factor from 2^71 to 2^72
2015-02-26	David Campeau	NF	no factor from 2^70 to 2^71
2015-01-15	chalsall	NF	no factor from 2^69 to 2^70
2014-03-02	LaurV	NF	no factor from 2^68 to 2^69
2009-05-07	Tom Mueller	C-LL	8D78F6D81804953B
2009-03-30	Tom Mueller	NF-PM1	B1=475000, B2=6887500