1 000 691 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
1203238863929	13	40.1	old
62924907481178813711	20	65.8	2014-12-12 11:42:39

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	104 / 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	Type	Base
Verified (Factored)	2024-10-24	Paul Underwood	BAAE45BB8642092D	0	1	3
Verified (Factored)	2025-09-01	Kriesel	BAAE45BB8642092D	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-28	Oliver Kruse	D5C88E76B7805B80	2	0	1	3
Verified	2017-10-15	Oliver Kruse	D5C88E76B7805B80	2	909850	1	3
Verified	2017-12-24	ATH	D5C88E76B7805B80	2	151322	1	3

P-1 factors

Date	Factor	B1	B2
2014-12-12	62924907481178813711	300000	10000000

History

Date	User	Type	Result
2025-09-01	NotoriousDJD	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	BAAE45BB8642092D PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2024-10-24	Dt12	CERT	PRP Certification CERT proof power = 7 Proof certified good
2024-10-24	Paul Underwood	C-PRP	BAAE45BB8642092D PRP proof power = 7 PRP: Verified (Factored) Proof certified good
2021-07-13	ATH	NF-PP1	Start=2/7, B1=1000000, B2=100000000
2021-02-20	ViliamF	NF-PM1	B1=25000000, B2=4025000000
2017-12-24	ATH	C-PRP	M1000691/1203238863929/62924907481178813711 : D5C88E76B7805B80 PRP: Verified PRP without proof (not generated)
2017-10-15	Oliver Kruse	C-PRP	M1000691/1203238863929/62924907481178813711 : D5C88E76B7805B80 PRP: Verified PRP without proof (not generated)
2017-09-28	Oliver Kruse	C-PRP	M1000691/1203238863929/62924907481178813711 : D5C88E76B7805B80 PRP: Verified PRP without proof (not generated)
2014-12-12	alpertron	F-PM1	Factor: 62924907481178813711 / (P-1, B1=300000, B2=10000000, E=12)