5 981 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 3 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
3883379567	10	31.9	old
5813193849719234279887	22	72.3	old
920897971113904463521683463886944231422262379753	48	159.3	2021-04-05 01:43:42

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	9201 / 9201
50	44000000	4245 / 16550

Estimated T-Level: 46.3 ⓘ

TF below 2^149 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-09-21	Oliver Kruse	68331E23CCB7E724	2	0	1	3
Verified (Factored)	2017-10-12	kkmrkkblmbrbk	68331E23CCB7E724	2	4604	1	3
Verified (Factored)	2020-04-17	Oliver Kruse	DAA5707345B1F1B2	2	4025	5	3
Verified	2021-04-05	mikr	DAA5707345B1F1B2	3	5082	5	3
Verified	2021-04-06	Joe S.	DAA5707345B1F1B2	3	674	5	3

History

Date	User	Type	Result
2023-07-25	-Anonymous-	NF-PM1	B1=41000000000, B2=167115816667049250
2021-07-07	ViliamF	NF-PM1	B1=1000000000, B2=201000000000
2021-04-06	Joe S.	C-PRP	M5981/3883379567/5813193849719234279887/920897971113904463521683463886944231422262379753 : DAA5707345B1F1B2 PRP: Verified PRP without proof (small exponent)
2021-04-05	mikr	C-PRP	M5981/3883379567/5813193849719234279887/920897971113904463521683463886944231422262379753 : DAA5707345B1F1B2 PRP: Verified PRP without proof (small exponent)
2021-04-05	Ryan Propper	F-ECM	Factor: 920897971113904463521683463886944231422262379753 / (ECM curve 1, B1=110000000, B2=900514153782, Sigma=6655558767059810617)
2020-04-17	Oliver Kruse	C-PRP	M5981/3883379567/5813193849719234279887 : DAA5707345B1F1B2 PRP: Verified PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M5981/3883379567/5813193849719234279887 : 68331E23CCB7E724 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M5981/3883379567/5813193849719234279887 : 68331E23CCB7E724 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M5981/3883379567/5813193849719234279887 : 68331E23CCB7E724 PRP without proof (not generated)