78 202 247 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 Lucas-Lehmer test

TF

No factors below 2⁷⁶

TF target 2⁷⁵

P-1

B1 =	725000
B2 =	14318750

Status	Date	User	Residue	Shift
Verified	2017-04-20	Tan Loe Joo	2824B0C3A7EC769B	9659996
Verified	2025-09-21	Franklin Webber	2824B0C3A7EC769B	34269657

History

Date	User	Type	Result
2025-09-21	Franklin Webber	C-LL	2824B0C3A7EC769B
2024-08-04	Sid & Andy	NF	no factor from 2^75 to 2^76
2017-04-20	Tan Loe Joo	C-LL	2824B0C3A7EC769B
2016-04-05	Mark Rose	NF	no factor from 2^62 to 2^64
2016-01-16	AirSquirrels	NF	no factor from 2^74 to 2^75
2015-05-10	Andrei Piaive	NF-PM1	B1=725000, B2=14318750
2014-09-25	brilong	NF	no factor from 2^73 to 2^74
2014-09-25	brilong	NF	no factor from 2^72 to 2^73
2014-09-22	garo	NF	no factor from 2^71 to 2^72
2014-02-23	PascalBieri	NF	no factor from 2^70 to 2^71
2011-01-01	-Anonymous-	NF	no factor from 2^69 to 2^70
2010-12-30	-Anonymous-	NF	no factor from 2^68 to 2^69
2010-12-30	Torchwood Institute	NF	no factor from 2^67 to 2^68
2010-10-27	Poaken	NF	no factor from 2^66 to 2^67
2010-10-23	ANONYMOUS	NF	no factor from 2^65 to 2^66
2010-10-22	Serhat Sakarya	NF	no factor from 2^64 to 2^65