1 132 561 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
69990897568026765401	20	65.9	2012-01-28 10:39:45

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
Verified (Factored)		David Slowinski	1B8B	0
Verified (Factored)		Joel Smith	825B67E1C974FB8B	0
Verified (Factored)	2002-06-23	S57483	825B67E1C974FB8B	678094

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-01	Kriesel	4ECEA002B38C0CEA	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-29	Oliver Kruse	BD03A309CE06EEB5	1	0	1	3
Verified	2017-10-16	Oliver Kruse	BD03A309CE06EEB5	1	826370	1	3
Verified	2018-01-04	ATH	BD03A309CE06EEB5	1	224259	1	3

History

Date	User	Type	Result
2025-09-02	Headed	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-01	Kriesel	C-PRP	4ECEA002B38C0CEA PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2025-01-07	yuriy_5-1	NF-PM1	B1=226000, B2=1043741160
2022-04-12	LordJulius	NF	no factor from 2^63 to 2^64
2022-04-12	LordJulius	NF	no factor from 2^62 to 2^63
2022-04-12	LordJulius	NF	no factor from 2^61 to 2^62
2022-04-12	LordJulius	NF	no factor from 2^1 to 2^61
2022-03-07	LordJulius	NF	no factor from 2^58 to 2^60
2018-01-04	ATH	C-PRP	M1132561/69990897568026765401 : BD03A309CE06EEB5 PRP: Verified PRP without proof (not generated)
2017-10-16	Oliver Kruse	C-PRP	M1132561/69990897568026765401 : BD03A309CE06EEB5 PRP: Verified PRP without proof (not generated)
2017-09-29	Oliver Kruse	C-PRP	M1132561/69990897568026765401 : BD03A309CE06EEB5 PRP: Verified PRP without proof (not generated)
2016-03-17	alpertron	NF-PM1	B1=300000, B2=10000000, E=12
2012-01-28	markr	F-PM1	Factor: 69990897568026765401
2009-02-16	Sturle Sunde	NF	no factor from 2^60 to 2^61