78 921 841 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 2⁷⁵

TF target 2⁷⁵

P-1

B1 =	690000
B2 =	14145000

Status	Date	User	Residue	Shift
Verified	2017-05-10	AirSquirrels	DA2DF5EDE43519E1	0
Verified	2024-11-27	Torchwood Institute	DA2DF5EDE43519E1	57534287

History

Date	User	Type	Result
2024-11-27	Torchwood Institute	C-LL	DA2DF5EDE43519E1
2017-05-10	AirSquirrels	C-LL	DA2DF5EDE43519E1
2015-12-20	TheJudger	NF-PM1	B1=690000, B2=14145000, E=12
2015-12-04	dh1	NF	no factor from 2^74 to 2^75
2015-12-04	dh1	NF	no factor from 2^73 to 2^74
2015-12-02	1997rj7	NF	no factor from 2^72 to 2^73
2014-02-22	Ilya Alexandrov	NF	no factor from 2^71 to 2^72
2014-02-22	Ilya Alexandrov	NF	no factor from 2^70 to 2^71
2010-12-23	lhunt	NF	no factor from 2^69 to 2^70
2010-12-07	bucky_mb	NF	no factor from 2^68 to 2^69
2010-12-04	play0r	NF	no factor from 2^67 to 2^68
2010-11-30	-Anonymous-	NF	no factor from 2^66 to 2^67
2010-11-23	-Anonymous-	NF	no factor from 2^65 to 2^66
2010-11-14	cnaTb_xo4y	NF	no factor from 2^64 to 2^65
2008-06-16	-Anonymous-	NF	no factor to 2^64