2 166 877 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
151681391	9	27.2	old
12857607966968158343249	23	73.4	2016-03-30 16:13:52
125393984872554450154303	24	76.7	2022-10-25 22:05:55

ECM

Digits	B1	Curves
25	50000	103 / 280

Estimated T-Level: 21.8 ⓘ

TF below 2^68 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-09	kkmrkkblmbrbk	049A6083A5423B49	2	0	1	3
Verified (Factored)	2017-10-21	Oliver Kruse	049A6083A5423B49	2	254889	1	3
Verified	2022-10-26	Kevin_9611	43EEC09012D8510D	3	1662965	5	3

P-1 factors

Date	Factor	B1	B2
2016-03-30	12857607966968158343249	500000	15000000

History

Date	User	Type	Result
2022-10-26	curtisc	CERT	PRP Certification Proof certified good
2022-10-26	Kevin_9611	C-PRP	M2166877/151681391/12857607966968158343249/125393984872554450154303 : 43EEC09012D8510D PRP proof power = 7 PRP: Verified Proof certified good
2022-10-25	_p95holder_	F-ECM	Factor: 125393984872554450154303 / (ECM curve 1, B1=50000, B2=5000000)
2017-10-21	Oliver Kruse	C-PRP	M2166877/151681391/12857607966968158343249 : 049A6083A5423B49 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-09	kkmrkkblmbrbk	C-PRP	M2166877/151681391/12857607966968158343249 : 049A6083A5423B49 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-30	alpertron	F-PM1	Factor: 12857607966968158343249 / (P-1, B1=500000, B2=15000000, E=12)