1 987 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 4 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
67559	5	16.0	old
75839863521727841	17	56.1	old
916991166020177609	18	59.7	old
63713905345969986120190693589745461903	38	125.6	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	39795 / 40830

Estimated T-Level: 54.9 ⓘ

TF below 2^177 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	DE33C0C853E84C2E	4	0	1	3
Verified	2017-10-02	kkmrkkblmbrbk	DE33C0C853E84C2E	4	0	1	3
Verified	2017-12-07	ATH	DE33C0C853E84C2E	4	1167	1	3
Verified	2020-04-17	Oliver Kruse	51C32B7EB4F73918	4	671	5	3
Verified	2020-08-12	_p95holder_	51C32B7EB4F73918	4	1920	5	3

History

Date	User	Type	Result
2024-03-24	masser	NF-PM1	B1=215000000000, B2=485426192019118350
2023-08-16	Joss	NF-PM1	B1=10000000000, B2=1241267197920750
2023-08-16	Joss	NF-PM1	B1=10000000000, B2=358994208122550
2021-07-26	ViliamF	NF-PP1	Start=2/7, B1=1000000000, B2=221000000000
2020-08-12	_p95holder_	C-PRP	M1987/67559/75839863521727841/916991166020177609/63713905345969986120190693589745461903 : 51C32B7EB4F73918 PRP: Verified PRP without proof (small exponent)
2020-04-17	Oliver Kruse	C-PRP	M1987/67559/75839863521727841/916991166020177609/63713905345969986120190693589745461903 : 51C32B7EB4F73918 PRP: Verified PRP without proof (small exponent)
2017-12-07	ATH	C-PRP	M1987/67559/75839863521727841/916991166020177609/63713905345969986120190693589745461903 : DE33C0C853E84C2E PRP: Verified PRP without proof (small exponent)
2017-10-02	kkmrkkblmbrbk	C-PRP	M1987/67559/75839863521727841/916991166020177609/63713905345969986120190693589745461903 : DE33C0C853E84C2E PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M1987/known_factors : DE33C0C853E84C2E PRP without proof (not generated)
2016-09-07	kkmrkkblmbrbk	NF-PM1	B1=1000000000, B2=100000000000, E=12