42 608 551 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 2⁷⁶

TF target 2⁷²

P-1

B1 =	1500000
B2 =	45000000

ECM

Digits	B1	Curves
25	50000	16 / 280

Estimated T-Level: 20.3 ⓘ

Status	Date	User	Residue	Shift
Verified	2009-07-15	Bruce Anderson	1867705B97830793	15781526
Verified	2017-11-20	Smok_bmv	1867705B97830793	12062424

History

Date	User	Type	Result
2021-11-07	One Man	NF-PP1	Start=6/5, B1=600000, B2=13800000
2021-09-12	One Man	NF-PP1	Start=2/7, B1=600000, B2=22800000
2021-06-30	-Anonymous-	NF	no factor from 2^75 to 2^76
2021-06-30	Yves de Wandelaar	NF	no factor from 2^74 to 2^75
2021-03-18	Sid & Andy	NF-PM1	B1=1500000, B2=45000000
2020-01-17	-Anonymous-	NF	no factor from 2^73 to 2^74
2019-10-11	-Anonymous-	NF	no factor from 2^72 to 2^73
2017-11-20	Smok_bmv	C-LL	1867705B97830793
2015-08-30	-Anonymous-	NF	no factor from 2^71 to 2^72
2015-04-04	Mark Rose	NF	no factor from 2^70 to 2^71
2015-02-19	chalsall	NF	no factor from 2^69 to 2^70
2014-03-08	LaurV	NF	no factor from 2^68 to 2^69
2009-07-15	Bruce Anderson	C-LL	1867705B97830793
2009-03-24	DSheets	NF-PM1	B1=445000, B2=3671250