12 487 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
230304780283104681047	21	67.6	2008-08-29 02:24:30
697135068970754375977	21	69.2	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1251 / 9201

Estimated T-Level: 40.7 ⓘ

TF below 2^130 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	A834B1A46AE6C4F4	2	0	1	3
Verified	2017-10-02	kkmrkkblmbrbk	A834B1A46AE6C4F4	2	0	1	3
Verified	2017-12-07	ATH	A834B1A46AE6C4F4	2	2483	1	3
Verified	2020-04-17	Oliver Kruse	2C795AD4FDAA71BE	2	4058	5	3

P-1 factors

Date	Factor	B1	B2
2023-05-21	160553538886956614341064034241948104007919	100000000000	120417199046794656

History

Date	User	Type	Result
2023-05-21	-Anonymous-	F-PM1	Factors: 697135068970754375977,230304780283104681047 / (P-1, B1=100000000000, B2=120417199046794650)
2020-04-17	Oliver Kruse	C-PRP	M12487/230304780283104681047/697135068970754375977 : 2C795AD4FDAA71BE PRP: Verified PRP without proof (small exponent)
2017-12-07	ATH	C-PRP	M12487/230304780283104681047/697135068970754375977 : A834B1A46AE6C4F4 PRP: Verified PRP without proof (small exponent)
2017-10-02	kkmrkkblmbrbk	C-PRP	M12487/230304780283104681047/697135068970754375977 : A834B1A46AE6C4F4 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M12487/697135068970754375977/230304780283104681047 : A834B1A46AE6C4F4 PRP without proof (not generated)
2016-09-09	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12
2008-08-29	-Anonymous-	F-ECM	Factor: 230304780283104681047