121 283 081 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 2⁷⁷

TF target 2⁷⁷

P-1

B1 =	856000
B2 =	219398550

Status	Date	User	Residue	Shift	Type	Base
Verified	2024-06-02	Inhumierer	628A7E85BE4E4407	29582166	1	3

History

Date	User	Type	Result
2024-06-02	Jonathan Webb	CERT	PRP Certification CERT proof power = 8 Proof certified good
2024-06-02	Inhumierer	C-PRP	628A7E85BE4E4407 PRP proof power = 8 PRP: Verified Proof certified good
2024-01-28	Alvin Bunk	NF-PM1	B1=856000, B2=219398550
2022-06-22	TheJudger	NF	no factor from 2^76 to 2^77
2021-08-20	TheJudger	NF	no factor from 2^75 to 2^76
2021-08-15	RichD0	NF	no factor from 2^74 to 2^75
2021-07-08	SRBase	NF	no factor from 2^73 to 2^74
2020-10-28	SRBase	NF	no factor from 2^72 to 2^73
2015-05-30	SMoffat	NF	no factor from 2^71 to 2^72
2015-05-23	SMoffat	NF	no factor from 2^70 to 2^71
2013-11-22	GrunwalderGIMP	NF	no factor from 2^69 to 2^70
2013-11-22	GrunwalderGIMP	NF	no factor from 2^68 to 2^69
2013-11-22	GrunwalderGIMP	NF	no factor from 2^66 to 2^68
2012-08-11	Andrew B	NF	no factor from 2^65 to 2^66
2010-10-22	garo	NF	no factor from 2^64 to 2^65
2010-05-18	sasaki3	NF	no factor from 2^63 to 2^64