9 967 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 1 known prime factor. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
41557302123847080424871	23	75.1	old

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	6215 / 16550

Estimated T-Level: 46.9 ⓘ

TF below 2^151 is very unlikely to find new factors due to ECM effort.

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	No proof (small exponent)	2017-09-21	Oliver Kruse	827DC6B85360A68F	1	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	827DC6B85360A68F	1	2091	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	C76BB5F1BBA59A7B	1	1099	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	C76BB5F1BBA59A7B	1	7711	5	3

History

Date	User	Type	Result
2025-03-18	masser	NF-PP1	Start=171/61, B1=1000000000, B2=999000000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M9967/41557302123847080424871 : C76BB5F1BBA59A7B
2023-06-10	JacobZ	NF-PM1	B1=58000000000, B2=241250667952694400
2022-11-24	Kevin_9611	NF-PM1	B1=1000000000, B2=100294988083290
2022-02-05	Joss	NF-PM1	B1=1000000, B2=6010952007060
2020-04-17	Oliver Kruse	C-PRP	M9967/41557302123847080424871 : C76BB5F1BBA59A7B
2017-10-12	kkmrkkblmbrbk	C-PRP	M9967/41557302123847080424871 : 827DC6B85360A68F
2017-09-21	Oliver Kruse	C-PRP	M9967/41557302123847080424871 : 827DC6B85360A68F
2017-09-21	Oliver Kruse	C-PRP	M9967/41557302123847080424871 : 827DC6B85360A68F