49 676 687 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
51553262341839767920198847	26	85.4	2021-09-05 17:51:03

ECM

Digits	B1	Curves
25	50000	11 / 280

Estimated T-Level: 20.2 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	2011-09-22	WR	BB00398E4B76B947	6617749
Verified (Factored)	2019-08-23	De_Martian	BB00398E4B76B947	20861250

History

Date	User	Type	Result
2021-09-05	Anton Repko	F-PP1	Start=2/7, B1=700000, B2=34300000, Factor: 51553262341839767920198847
2021-03-07	Sid & Andy	NF-PM1	B1=1500000, B2=45000000
2019-08-23	De_Martian	C-LL	BB00398E4B76B947
2018-12-24	-Anonymous-	NF	no factor from 2^73 to 2^74
2018-02-15	monst	NF	no factor from 2^72 to 2^73
2015-11-25	dragonbud20	NF	no factor from 2^71 to 2^72
2011-09-22	WR	C-LL	BB00398E4B76B947
2011-08-05	David Campeau	NF	no factor from 2^70 to 2^71
2010-10-19	-Anonymous-	NF-PM1	B1=720000