56 238 131 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

TF

No factors below 2⁷⁴

TF target 2⁷³

P-1

B1 =	565000
B2 =	12288750

Status	Date	User	Residue	Shift
Bad	2012-09-09	tromc	990D9EBFE4879933	14974963
Verified	2013-07-19	Brian Carpenter	1C6D7C3B0A6C838A	14272093
Verified	2016-09-24	AirSquirrels	1C6D7C3B0A6C838A	51310433

History

Date	User	Type	Result
2019-02-03	TheJudger	NF	no factor from 2^73 to 2^74
2016-09-24	AirSquirrels	C-LL	1C6D7C3B0A6C838A
2016-02-23	Mark Rose	NF	no factor from 2^60 to 2^63
2015-07-28	Mark Rose	NF	no factor from 2^72 to 2^73
2013-07-19	Brian Carpenter	C-LL	1C6D7C3B0A6C838A
2012-09-09	tromc	C-LL	990D9EBFE4879933
2012-06-09	Jerry Hallett	NF-PM1	B1=565000, B2=12288750, E=12
2012-05-13	Craig Meyers	NF	no factor from 2^71 to 2^72
2012-03-05	Pi_Rho	NF	no factor from 2^70 to 2^71
2011-06-05	Ungelovende	NF	no factor from 2^69 to 2^70
2011-04-12	exhopp	NF	no factor from 2^68 to 2^69
2009-11-19	Sturle Sunde	NF	no factor from 2^67 to 2^68
2008-07-10	Sturle Sunde	NF	no factor from 2^66 to 2^67
2008-07-10	Sturle Sunde	NF	no factor from 2^65 to 2^66
2008-07-09	Sturle Sunde	NF	no factor from 2^64 to 2^65
2008-07-09	Sturle Sunde	NF	no factor from 2^63 to 2^64