61 438 669 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 2⁷⁴

TF target 2⁷⁴

P-1

B1 =	580000
B2 =	11600000

Status	Date	User	Residue	Shift
Verified	2013-09-30	Son Johan	E188F81E4B1D23EE	11722432
Verified	2022-04-25	Denis Porva	E188F81E4B1D23EE	7406248

History

Date	User	Type	Result
2022-04-25	Denis Porva	C-LL	E188F81E4B1D23EE
2016-03-04	-Anonymous-	NF	no factor from 2^73 to 2^74
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2013-09-30	Son Johan	C-LL	E188F81E4B1D23EE
2013-05-06	Architects Cubed	NF-PM1	B1=580000, B2=11600000, E=6
2013-01-31	Jerry Hallett	NF	no factor from 2^72 to 2^73
2013-01-31	Jerry Hallett	NF	no factor from 2^71 to 2^72
2012-09-04	Bold_Seeker	NF	no factor from 2^70 to 2^71
2011-11-10	-Anonymous-	NF	no factor from 2^69 to 2^70
2009-10-19	{WC}PistolPete	NF	no factor from 2^68 to 2^69
2009-10-15	{WC}PistolPete	NF	no factor from 2^67 to 2^68
2009-08-05	Geoff Wing	NF	no factor from 2^66 to 2^67
2009-07-26	NedB	NF	no factor from 2^65 to 2^66
2009-07-23	Paladin	NF	no factor from 2^64 to 2^65
2009-06-03	Architects Cubed	NF	no factor from 2^63 to 2^64