2 647 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
387286059767743	15	48.5	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	9201 / 9201
50	44000000	16550 / 16550
55	110000000	7352 / 40830

Estimated T-Level: 50.9 ⓘ

TF below 2^164 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-21	Oliver Kruse	F5F4D2F46CA65F18	1	0	1	3
Verified	2017-10-12	kkmrkkblmbrbk	F5F4D2F46CA65F18	1	1658	1	3
Verified	2020-04-17	Oliver Kruse	60F4E7684E4682F1	1	1839	5	3
Verified	2024-02-03	Wentao Huang	60F4E7684E4682F1	1	184	5	3

History

Date	User	Type	Result
2024-02-03	Wentao Huang	C-PRP	M2647/387286059767743 : 60F4E7684E4682F1 PRP: Verified PRP without proof (small exponent)
2022-01-26	mikr	NF-PM1	B1=60000000000, B2=314768631447540270
2021-07-05	ViliamF	NF-PM1	B1=1000000000, B2=191000000000
2020-04-17	Oliver Kruse	C-PRP	M2647/387286059767743 : 60F4E7684E4682F1 PRP: Verified PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M2647/387286059767743 : F5F4D2F46CA65F18 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M2647/387286059767743 : F5F4D2F46CA65F18 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M2647/387286059767743 : F5F4D2F46CA65F18 PRP without proof (not generated)