74 521 991 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 PRP test

TF

No factors below 2⁷⁵

TF target 2⁷⁴

P-1

B1 =	620000
B2 =	12555000

Status	Date	User	Residue	Shift
Unverified	2016-03-18	aurashift	772386DB407326__	50102432

Status	Date	User	Residue	Shift	Type	Base
Verified	2024-11-28	Luke Durant	685F7C7523896DE5	0	1	3

History

Date	User	Type	Result
2024-11-28	proski	CERT	PRP Certification CERT proof power = 9 Proof certified good
2024-11-28	Luke Durant	C-PRP	685F7C7523896DE5 PRP proof power = 9 PRP: Verified Proof certified good
2016-04-01	Mark Rose	NF	no factor from 2^57 to 2^64
2016-03-18	aurashift	C-LL	772386DB407326__
2015-12-26	Filen	NF-PM1	B1=620000, B2=12555000, E=12
2015-12-20	TheJudger	NF	no factor from 2^74 to 2^75
2015-12-20	TheJudger	NF	no factor from 2^73 to 2^74
2015-11-23	ixfd64	NF	no factor from 2^72 to 2^73
2015-08-20	Judge Hale	NF	no factor from 2^71 to 2^72
2013-12-02	symallad	NF	no factor from 2^70 to 2^71
2013-01-29	svistak	NF	no factor from 2^69 to 2^70
2013-01-29	svistak	NF	no factor from 2^65 to 2^66
2010-10-04	Victor	NF	no factor from 2^68 to 2^69
2010-10-04	Helmut Zulus	NF	no factor from 2^67 to 2^68
2010-09-29	shbris	NF	no factor from 2^66 to 2^67
2010-07-29	Bold_Seeker	NF	no factor from 2^65 to 2^66
2010-07-28	riccardo uberti	NF	no factor from 2^64 to 2^65