2 557 201 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
8036689788175280968447	22	72.8	2009-02-15 23:51:40
108485317997166505207616833	27	86.5	2018-12-29 19:54:30

ECM

Digits	B1	Curves
25	50000	26 / 280

Estimated T-Level: 20.5 ⓘ

TF below 2^63 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Szymon Krzysztof Lobocki	4317E88E007CA2F6	0
Verified (Factored)	1999-03-26	Bruce Mitchell	4317E88E007CA2F6	758383

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-14	Oliver Kruse	15890FB915377EEF	1	177778	5	3
Verified (Factored)	2017-12-01	kkmrkkblmbrbk	15890FB915377EEF	1	472948	5	3
Verified	2018-12-30	Oliver Kruse	15890FB915377EEF	2	1145277	5	3
Verified	2018-12-30	Daniil Tsarkov	15890FB915377EEF	2	1828241	5	3

P-1 factors

Date	Factor	B1	B2
2018-12-29	108485317997166505207616833	2000000	60000000

History

Date	User	Type	Result
2022-03-11	LordJulius	NF	no factor from 2^1 to 2^60
2018-12-30	Daniil Tsarkov	C-PRP	M2557201/8036689788175280968447/108485317997166505207616833 : 15890FB915377EEF PRP: Verified PRP without proof (not generated)
2018-12-30	Oliver Kruse	C-PRP	M2557201/8036689788175280968447/108485317997166505207616833 : 15890FB915377EEF PRP: Verified PRP without proof (not generated)
2018-12-29	alpertron	F-PM1	Factor: 108485317997166505207616833 / (P-1, B1=2000000, B2=60000000, E=12)
2017-12-01	kkmrkkblmbrbk	C-PRP	M2557201/8036689788175280968447 : 15890FB915377EEF PRP: Verified PRP without proof (not generated)
2017-10-14	Oliver Kruse	C-PRP	M2557201/8036689788175280968447 : 15890FB915377EEF PRP: Verified PRP without proof (not generated)
2009-02-15	SubPrime	F-ECM	Factor: 8036689788175280968447
2009-02-01	Sturle Sunde	NF	no factor from 2^60 to 2^61