2 556 493 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
54577054111869050681	20	65.6	2010-05-07 17:14:15
2752076921647039960110206639	28	91.2	2018-12-27 01:29:06

ECM

Digits	B1	Curves
25	50000	61 / 280

Estimated T-Level: 21.1 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Danny van der Rijn	3924516181D5C258	0
Bad	1999-07-26	Smegheads	BF564044A3D03B57	975958
Verified (Factored)	1999-09-22	Kevin Jaget	3924516181D5C258	1720823

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-14	Oliver Kruse	0F2F0DA29D86ABCE	1	1179868	5	3
Verified (Factored)	2017-12-01	kkmrkkblmbrbk	0F2F0DA29D86ABCE	1	1387979	5	3
Verified	2018-12-27	ATH	0F2F0DA29D86ABCE	2	1734378	5	3

P-1 factors

Date	Factor	B1	B2
2018-12-27	2752076921647039960110206639	2000000	60000000

History

Date	User	Type	Result
2022-03-11	LordJulius	NF	no factor from 2^1 to 2^60
2018-12-27	ATH	C-PRP	M2556493/54577054111869050681/2752076921647039960110206639 : 0F2F0DA29D86ABCE PRP: Verified PRP without proof (not generated)
2018-12-27	alpertron	F-PM1	Factor: 2752076921647039960110206639 / (P-1, B1=2000000, B2=60000000, E=12)
2017-12-01	kkmrkkblmbrbk	C-PRP	M2556493/54577054111869050681 : 0F2F0DA29D86ABCE PRP: Verified PRP without proof (not generated)
2017-10-14	Oliver Kruse	C-PRP	M2556493/54577054111869050681 : 0F2F0DA29D86ABCE PRP: Verified PRP without proof (not generated)
2010-05-07	Chang Chia-Tche	F-ECM	Factor: 54577054111869050681
2009-02-01	Sturle Sunde	NF	no factor from 2^60 to 2^61