9 187 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
2568808998473618191634080841213231539849	40	130.9	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	6630 / 16550

Estimated T-Level: 47.0 ⓘ

TF below 2^151 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	B68831616F41BC1D	1	0	1	3
Verified	2017-10-02	kkmrkkblmbrbk	B68831616F41BC1D	1	0	1	3
Verified	2017-12-07	ATH	B68831616F41BC1D	1	1288	1	3
Verified	2020-04-17	Oliver Kruse	5F8F52449DC3A6D5	1	8317	5	3
Verified	2024-07-01	kkmrkkblmbrbk	5F8F52449DC3A6D5	1	2112	5	3

History

Date	User	Type	Result
2024-07-01	kkmrkkblmbrbk	C-PRP	M9187/2568808998473618191634080841213231539849 : 5F8F52449DC3A6D5 PRP: Verified PRP without proof (small exponent)
2023-07-12	JacobZ	NF-PM1	B1=63000000000, B2=255469764292442700
2021-12-16	Lisander Viaene	NF-PM1	B1=100000000
2020-04-17	Oliver Kruse	C-PRP	M9187/2568808998473618191634080841213231539849 : 5F8F52449DC3A6D5 PRP: Verified PRP without proof (small exponent)
2017-12-07	ATH	C-PRP	M9187/2568808998473618191634080841213231539849 : B68831616F41BC1D PRP: Verified PRP without proof (small exponent)
2017-10-02	kkmrkkblmbrbk	C-PRP	M9187/2568808998473618191634080841213231539849 : B68831616F41BC1D PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M9187/known_factors : B68831616F41BC1D PRP without proof (not generated)