1 171 771 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
18748337	8	24.2	old
126113984154679	15	46.8	2008-08-26 19:53:04

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	100 / 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)	2025-09-01	Kriesel	29E91107E785CC57	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-29	Oliver Kruse	01E0DD051BB325D5	2	0	1	3
Verified	2017-10-17	Oliver Kruse	01E0DD051BB325D5	2	103490	1	3
Verified	2018-01-06	ATH	01E0DD051BB325D5	2	287368	1	3

History

Date	User	Type	Result
2025-09-02	sbe2	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	29E91107E785CC57 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2024-10-02	yuriy_5-1	NF-PM1	B1=1171772, B2=100175575500
2018-01-06	ATH	C-PRP	M1171771/18748337/126113984154679 : 01E0DD051BB325D5 PRP: Verified PRP without proof (not generated)
2017-10-17	Oliver Kruse	C-PRP	M1171771/18748337/126113984154679 : 01E0DD051BB325D5 PRP: Verified PRP without proof (not generated)
2017-09-29	Oliver Kruse	C-PRP	M1171771/18748337/126113984154679 : 01E0DD051BB325D5 PRP: Verified PRP without proof (not generated)
2008-08-26	-Anonymous-	F	Factor: 126113984154679