1 311 689 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
12531880217312940277543687069843369	35	113.3	2014-06-03 07:04:30

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Joel Armengaud	11FB04B08C202673	0
Verified (Factored)		Cornelius Caesar	11FB04B08C202673	0
Verified (Factored)		Brian J. Beesley	11FB04B08C202673	291842

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	Oliver Kruse	4212B83591AB3735	1	0	1	3
Verified	2017-10-22	kkmrkkblmbrbk	4212B83591AB3735	1	221253	1	3

P-1 factors

Date	Factor	B1	B2
2014-06-03	12531880217312940277543687069843369	4081679	151022134

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^58 to 2^60
2017-10-22	kkmrkkblmbrbk	C-PRP	M1311689/12531880217312940277543687069843369 : 4212B83591AB3735 PRP: Verified PRP without proof (not generated)
2017-09-30	Oliver Kruse	C-PRP	M1311689/12531880217312940277543687069843369 : 4212B83591AB3735 PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2014-06-03	mikr	F-PM1	Factor: 12531880217312940277543687069843369
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-05-09	Xyzzy	NF	no factor from 2^61 to 2^62
2009-02-14	Sturle Sunde	NF	no factor from 2^60 to 2^61