2 121 631 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
123054599	9	26.9	old
280055292001	12	38.0	2008-07-14 20:20:36
45028778013048738142439	23	75.3	2022-09-06 16:50:23
97039556231293194800129	23	76.4	2016-03-09 11:18:44

ECM

Digits	B1	Curves
25	50000	101 / 280

Estimated T-Level: 21.8 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-07	Oliver Kruse	81FB7E9E9DC3B564	1	0	1	3
Verified (Factored)	2017-10-17	Oliver Kruse	C0C498122148A3B3	3	665280	5	3
Verified (Factored)	2017-11-17	ATH	C0C498122148A3B3	3	1274503	5	3
Verified	2022-09-09	_p95holder_	C0C498122148A3B3	4	794994	5	3

P-1 factors

Date	Factor	B1	B2
2016-03-09	97039556231293194800129	500000	15000000

History

Date	User	Type	Result
2022-09-09	_p95holder_	C-PRP	M2121631/123054599/280055292001/97039556231293194800129/45028778013048738142439 : C0C498122148A3B3 PRP: Verified PRP without proof (not generated)
2022-09-06	_p95holder_	F-ECM	Factor: 45028778013048738142439 / (ECM curve 5, B1=50000, B2=5000000)
2017-11-17	ATH	C-PRP	M2121631/123054599/280055292001/97039556231293194800129 : C0C498122148A3B3 PRP: Verified PRP without proof (not generated)
2017-10-17	Oliver Kruse	C-PRP	M2121631/123054599/280055292001/97039556231293194800129 : C0C498122148A3B3 PRP: Verified PRP without proof (not generated)
2017-10-07	Oliver Kruse	C-PRP	M2121631/123054599/280055292001/97039556231293194800129 : 81FB7E9E9DC3B564 PRP: Verified PRP without proof (not generated)
2016-03-09	alpertron	F-PM1	Factor: 97039556231293194800129 / (P-1, B1=500000, B2=15000000, E=12)
2008-07-14	George Woltman	F-ECM	Factor: 280055292001