61 138 489 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 2⁷⁴

P-1

B1 =	1800000
B2 =	118800000

Status	Date	User	Residue	Shift
Unverified	2013-04-10	curtisc	D8D21B5C4BF691__	56748534

Status	Date	User	Residue	Shift	Type	Base
Verified	2022-06-17	Kriesel	931C1FB6A31BB137	57379077	1	3

History

Date	User	Type	Result
2022-06-18	Choi4KANG	CERT	PRP Certification CERT proof power = 9 Proof certified good
2022-06-17	Kriesel	C-PRP	931C1FB6A31BB137 PRP proof power = 9 PRP: Verified Proof certified good
2022-03-10	Reboot It	NF-PM1	B1=1800000, B2=118800000
2016-03-12	-Anonymous-	NF	no factor from 2^73 to 2^74
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2013-04-10	curtisc	C-LL	D8D21B5C4BF691__
2013-02-10	curtisc	NF-PM1	B1=685000
2013-01-16	Jerry Hallett	NF	no factor from 2^71 to 2^73
2011-10-30	TheJudger	NF	no factor from 2^69 to 2^71
2009-07-13	Xyzzy	NF	no factor from 2^68 to 2^69
2009-02-27	glennpat	NF	no factor from 2^67 to 2^68
2009-02-23	James Hintz	NF	no factor from 2^66 to 2^67
2009-02-05	borgyg	NF	no factor from 2^65 to 2^66
2009-02-02	borgyg	NF	no factor from 2^64 to 2^65
2009-01-29	-Anonymous-	NF	no factor from 2^63 to 2^64