950 177 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 2 known prime factors. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
642517288817	12	39.2	old
258199194141296165599	21	67.8	2015-05-30 01:24:27

P-1 factors

Date	Factors	B1	B2
2015-05-30	258199194141296165599	1000000	30000000

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	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	No proof (small exponent)	2017-09-28	Oliver Kruse	9FAA26797C3E386D	2	0	1	3
Verified	No proof (small exponent)	2017-10-15	kkmrkkblmbrbk	9FAA26797C3E386D	2	853514	1	3
Verified	No proof (small exponent)	2020-04-24	Oliver Kruse	AFE67A9B885B21BD	2	319827	5	3
Verified	Certified Good	2025-05-25	kkmrkkblmbrbk	AFE67A9B885B21BD	2	25935	5	3

History

Date	User	Type	Result
2025-05-25	Massimo Cappelli (ik5pwa)	CERT	Proof certified good
2025-05-25	kkmrkkblmbrbk	C-PRP	Proof Certified Good Proof Power: 6
2020-04-24	Oliver Kruse	C-PRP	M950177/642517288817/258199194141296165599 : AFE67A9B885B21BD
2017-10-15	kkmrkkblmbrbk	C-PRP	M950177/642517288817/258199194141296165599 : 9FAA26797C3E386D
2017-09-28	Oliver Kruse	C-PRP	M950177/642517288817/258199194141296165599 : 9FAA26797C3E386D
2016-03-17	alpertron	NF-PM1	B1=200000, B2=5000000, E=6
2015-05-30	alpertron	F-PM1	Factor: 258199194141296165599 / B1=1000000, B2=30000000