4 283 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
80203116140787492698009223167	29	96.0	old
1014581894481062086635266411284139009925301539055947709872564246847	67	219.3	2021-04-15 23:46:11

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	2804 / 16550

Estimated T-Level: 45.8 ⓘ

TF below 2^147 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	665095E1DA15F9CD	1	0	1	3
Verified (Factored)	2017-10-12	kkmrkkblmbrbk	665095E1DA15F9CD	1	616	1	3
Verified (Factored)	2020-04-17	Oliver Kruse	B84DC619AA50CC69	1	2695	5	3
Verified	2021-04-16	mnd9	B84DC619AA50CC69	2	1209	5	3
Verified	2021-04-16	_p95holder_	B84DC619AA50CC69	2	3783	5	3
Verified	2021-04-19	Klaus Nordmann	B84DC619AA50CC69	2	3701	5	3

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-10-15	Phyxick	factor ECM small		0.00 %	2025-10-15

History

Date	User	Type	Result
2025-05-13	masser	NF-PP1	Start=159/71, B1=2600000000, B2=2597400000000
2023-05-20	-Anonymous-	NF-PM1	B1=75000000000, B2=751710476301835050
2021-07-05	ViliamF	NF-PM1	B1=1000000000, B2=201000000000
2021-04-19	Klaus Nordmann	C-PRP	M4283/80203116140787492698009223167/1014581894481062086635266411284139009925301539055947709872564246847 : B84DC619AA50CC69 PRP: Verified PRP without proof (small exponent)
2021-04-16	_p95holder_	C-PRP	M4283/80203116140787492698009223167/1014581894481062086635266411284139009925301539055947709872564246847 : B84DC619AA50CC69 PRP: Verified PRP without proof (small exponent)
2021-04-16	mnd9	C-PRP	M4283/80203116140787492698009223167/1014581894481062086635266411284139009925301539055947709872564246847 : B84DC619AA50CC69 PRP: Verified PRP without proof (small exponent)
2021-04-15	Ryan Propper	F-ECM	Factor: 1014581894481062086635266411284139009925301539055947709872564246847 / (ECM curve 1, B1=260000000, B2=3142865025316, Sigma=6655636513802850625)
2020-04-17	Oliver Kruse	C-PRP	M4283/80203116140787492698009223167 : B84DC619AA50CC69 PRP: Verified PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M4283/80203116140787492698009223167 : 665095E1DA15F9CD PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M4283/80203116140787492698009223167 : 665095E1DA15F9CD PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M4283/80203116140787492698009223167 : 665095E1DA15F9CD PRP without proof (not generated)