81 220 537 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Tested as composite (unverified): unconfirmed Lucas-Lehmer test says not-prime

TF

No factors below 2⁷⁵

TF target 2⁷⁵

P-1

B1 =	685000
B2 =	13357500

Status	Date	User	Residue	Shift
Unverified	2017-08-11	Rolls	DA31B77BBDEDCA__	1849069

History

Date	User	Type	Result
2017-08-11	Rolls	C-LL	DA31B77BBDEDCA__
2017-05-20	kkmrkkblmbrbk	NF-PM1	B1=685000, B2=13357500, E=6
2016-09-30	-Anonymous-	NF	no factor from 2^74 to 2^75
2016-09-30	-Anonymous-	NF	no factor from 2^73 to 2^74
2016-09-30	-Anonymous-	NF	no factor from 2^72 to 2^73
2016-09-30	-Anonymous-	NF	no factor from 2^71 to 2^72
2013-10-31	SMoffat	NF	no factor from 2^70 to 2^71
2013-02-01	rjbelans	NF	no factor from 2^69 to 2^70
2013-01-27	rjbelans	NF	no factor from 2^68 to 2^69
2013-01-25	rjbelans	NF	no factor from 2^67 to 2^68
2012-07-06	c10ck3r	NF	no factor from 2^65 to 2^67
2010-12-12	Architects Cubed	NF	no factor from 2^64 to 2^65