1 969 157 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
62501295232097	14	45.8	old
495192775201271349517127	24	78.7	2015-09-27 22:34:48
1148388360565247447542153	25	79.9	2022-07-14 08:09:30

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 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)	2025-09-02	Kriesel	2B3CECC3C5CB3CE8	0	1	3

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-09-30	alpertron	62AB38A8ED7B8CE1	2	0	1	3
Verified (Factored)	2017-10-20	Oliver Kruse	62AB38A8ED7B8CE1	2	1230509	1	3
Verified	2022-07-14	matzetoni	2B3CECC3C5CB3CE8	3	1642577	5	3

P-1 factors

Date	Factor	B1	B2
2015-09-27	495192775201271349517127	500000	15000000

History

Date	User	Type	Result
2025-09-03	Jurzal	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	2B3CECC3C5CB3CE8 PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2022-07-14	aperson1	CERT	PRP Certification Proof certified good
2022-07-14	matzetoni	C-PRP	M1969157/62501295232097/495192775201271349517127/1148388360565247447542153 : 2B3CECC3C5CB3CE8 PRP proof power = 7 PRP: Verified Proof certified good
2022-07-14	TJAOI	F-ECM	Factor: 1148388360565247447542153 / (ECM curve 173, B1=50000, B2=7500000)
2017-10-20	Oliver Kruse	C-PRP	M1969157/62501295232097/495192775201271349517127 : 62AB38A8ED7B8CE1 PRP: Verified (Factored) PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M1969157/62501295232097/495192775201271349517127 : 62AB38A8ED7B8CE1 PRP: Verified (Factored) PRP without proof (not generated)
2015-09-27	alpertron	F-PM1	Factor: 495192775201271349517127 / (P-1, B1=500000, B2=15000000, E=12)