56 879 741 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 2⁷⁶

TF target 2⁷³

P-1

B1 =	560000
B2 =	11200000

Status	Date	User	Residue	Shift
Verified	2013-07-19	curtisc	F5B24B3F067EB134	53036168
Verified	2020-10-21	ChavdarLalov	F5B24B3F067EB134	21727313

History

Date	User	Type	Result
2020-11-01	-Anonymous-	NF	no factor from 2^75 to 2^76
2020-10-25	-Anonymous-	NF	no factor from 2^74 to 2^75
2020-10-21	ChavdarLalov	C-LL	F5B24B3F067EB134
2018-11-30	Chuck	NF	no factor from 2^73 to 2^74
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^63
2016-01-22	-Anonymous-	NF	no factor from 2^72 to 2^73
2013-07-19	curtisc	C-LL	F5B24B3F067EB134
2012-07-22	TheJudger	NF-PM1	B1=560000, B2=11200000
2012-06-25	Jerry Hallett	NF	no factor from 2^71 to 2^72
2011-09-08	peridot887	NF	no factor from 2^70 to 2^71
2011-06-09	GrunwalderGIMP	NF	no factor from 2^69 to 2^70
2011-04-18	megavink	NF	no factor from 2^68 to 2^69
2009-11-22	cesanto	NF	no factor from 2^67 to 2^68
2008-09-03	Team_Inspector	NF	no factor from 2^66 to 2^67
2008-08-31	Carsten Kossendey	NF	no factor from 2^65 to 2^66
2008-08-22	Carsten Kossendey	NF	no factor from 2^64 to 2^65
2008-08-19	Carsten Kossendey	NF	no factor from 2^63 to 2^64