12 005 341 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
38579220750874653787631	23	75.0	2021-12-02 06:43:43

ECM

Digits	B1	Curves
25	50000	59 / 280

Estimated T-Level: 21.1 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Ken Kriesel	E048E4146F959783	1879962
Verified (Factored)	2004-07-13	Eric Peterson	E048E4146F959783	4893862

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-12-23	riccardo uberti	E4DFAB13D14E36FB	1	6993390	5	3

P-1 factors

Date	Factor	B1	B2
2021-12-02	38579220750874653787631	1200000	867331500

History

Date	User	Type	Result
2022-01-29	riccardo uberti	NF-PP1	Start=6/5, B1=2000000, B2=40000000
2022-01-01	riccardo uberti	NF-PP1	Start=2/7, B1=1500000, B2=30000000
2021-12-23	Sharks_w_Lasers	CERT	PRP Certification Proof certified good
2021-12-23	riccardo uberti	C-PRP	M12005341/38579220750874653787631 : E4DFAB13D14E36FB PRP proof power = 8 PRP: Verified Proof certified good
2021-12-02	lycorn	F-PM1	Factor: 38579220750874653787631 / (P-1, B1=1200000, B2=867331500)
2021-10-29	-Anonymous-	NF	no factor from 2^71 to 2^72
2020-11-30	mikr	NF	no factor from 2^70 to 2^71
2018-01-04	_p95holder_	NF	no factor from 2^69 to 2^70
2017-10-02	mikr	NF	no factor from 2^68 to 2^69
2015-02-03	Tha	NF	no factor from 2^67 to 2^68
2015-02-01	Tha	NF	no factor from 2^66 to 2^67
2013-10-05	Nesowa	NF	no factor from 2^65 to 2^66
2013-08-27	Tharsis	NF	no factor from 2^64 to 2^65
2012-03-10	Squeeky_Squirrel	NF-PM1	B1=230000, B2=5635000, E=6