1 977 329 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 3 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
195837970254089	15	47.5	old
252792412981943	15	47.8	2008-08-26 20:20:25
82131908652217799	17	56.2	2015-03-16 12:25:43

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	130 / 640

Estimated T-Level: 26.0 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	2ABCBB4EAF9C6F93	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-05	Oliver Kruse	0C9A0E63097C29B7	3	0	1	3
Verified	2017-11-15	kkmrkkblmbrbk	0C9A0E63097C29B7	3	1485176	1	3

History

Date	User	Type	Result
2025-09-03	Architects Cubed	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	2ABCBB4EAF9C6F93 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2023-05-31	USAFSS	NF-PM1	B1=600000, B2=830065236
2022-08-13	USAFSS	NF-PM1	B1=88000, B2=95986800
2017-11-15	kkmrkkblmbrbk	C-PRP	M1977329/195837970254089/252792412981943/82131908652217799 : 0C9A0E63097C29B7 PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1977329/195837970254089/252792412981943/82131908652217799 : 0C9A0E63097C29B7 PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1977329/195837970254089/252792412981943/82131908652217799 : 0C9A0E63097C29B7 PRP without proof (not generated)
2015-03-16	TJAOI	F	Factor: 82131908652217799 / TF: 56-57
2008-08-26	-Anonymous-	F	Factor: 252792412981943