102 251 221 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 2⁷⁶

TF target 2⁷⁶

P-1

B1 =	850000
B2 =	17850000

Status	Date	User	Residue	Shift	Type	Base
Verified	2021-01-19	Ben Delo	B5E34713A6405F64	81975813	1	3

History

Date	User	Type	Result
2021-01-19	arnaud	CERT	PRP Certification CERT proof power = 8 Proof certified good
2021-01-19	Ben Delo	C-PRP	B5E34713A6405F64 PRP proof power = 8 PRP: Verified Proof certified good
2021-01-17	Ben Delo	NF-PM1	B1=850000, B2=17850000, E=12
2020-10-24	Bill Staffen	NF	no factor from 2^75 to 2^76
2020-10-24	RichD0	NF	no factor from 2^74 to 2^75
2020-03-30	SRBase	NF	no factor from 2^73 to 2^74
2019-11-24	Ryan Propper	NF	no factor from 2^72 to 2^73
2014-12-12	RichD0	NF	no factor from 2^71 to 2^72
2014-11-01	charger	NF	no factor from 2^70 to 2^71
2014-05-02	Earle Lowe	NF	no factor from 2^69 to 2^70
2014-04-30	Earle Lowe	NF	no factor from 2^68 to 2^69
2014-04-29	Earle Lowe	NF	no factor from 2^67 to 2^68
2013-12-18	g0b	NF	no factor from 2^66 to 2^67
2012-04-24	GIMP Philippines	NF	no factor from 2^65 to 2^66
2010-08-18	Torchwood Institute	NF	no factor from 2^64 to 2^65
2010-04-05	1997rj7	NF	no factor from 2^63 to 2^64