261 241 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
5747303	7	22.5	old
908107507523351	15	49.7	2014-05-08 12:34:11
1523363970458706933551	22	70.4	2015-10-02 10:43:50
219022155227049346126463	24	77.5	2015-10-02 10:43:50
876599991015398048341410959	27	89.5	2020-07-27 10:56:08

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	415 / 640

Estimated T-Level: 28.2 ⓘ

TF below 2^89 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-09-22	Oliver Kruse	CC5D9A60BC5BB7FE	4	0	1	3
Verified (Factored)	2017-10-12	Oliver Kruse	CC5D9A60BC5BB7FE	4	72436	1	3
Verified (Factored)	2017-11-06	kkmrkkblmbrbk	CC5D9A60BC5BB7FE	4	202010	1	3
Verified (Factored)	2020-04-17	Oliver Kruse	DA467A1FAA45C2B3	4	181956	5	3
Verified	2020-07-27	M Miller	DA467A1FAA45C2B3	5	46391	5	3

History

Date	User	Type	Result
2022-05-03	Oliver Kruse	NF-PM1	B1=30000000, B2=10035812696910
2021-09-15	Oliver Kruse	NF-PM1	B1=30000000, B2=3000000000, E=24
2020-07-27	M Miller	C-PRP	M261241/5747303/908107507523351/1523363970458706933551/219022155227049346126463/876599991015398048341410959 : DA467A1FAA45C2B3 PRP: Verified PRP without proof (small exponent)
2020-07-27	TJAOI	F-ECM	Factor: 876599991015398048341410959 / (ECM curve 1, B1=250000, B2=25000000)
2020-04-17	Oliver Kruse	C-PRP	M261241/5747303/908107507523351/1523363970458706933551/219022155227049346126463 : DA467A1FAA45C2B3 PRP: Verified PRP without proof (small exponent)
2017-11-06	kkmrkkblmbrbk	C-PRP	M261241/5747303/908107507523351/1523363970458706933551/219022155227049346126463 : CC5D9A60BC5BB7FE PRP: Verified PRP without proof (small exponent)
2017-10-12	Oliver Kruse	C-PRP	M261241/5747303/908107507523351/1523363970458706933551/219022155227049346126463 : CC5D9A60BC5BB7FE PRP: Verified PRP without proof (small exponent)
2017-09-22	Oliver Kruse	C-PRP	M261241/known_factors : CC5D9A60BC5BB7FE PRP without proof (not generated)
2015-10-02	TJAOI	F-ECM	Factor: 219022155227049346126463 / (ECM curve 42, B1=50000, B2=5000000)
2015-10-02	TJAOI	F-ECM	Factor: 1523363970458706933551 / (ECM curve 17, B1=50000, B2=5000000)
2014-05-08	TJAOI	F	Factor: 908107507523351