13 187 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
1967289409	10	30.9	old
156217263701497	15	47.2	2008-08-29 02:24:32

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1384 / 9201

Estimated T-Level: 40.8 ⓘ

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	40AF66BA298D9807	2	0	1	3
Verified	2017-10-12	kkmrkkblmbrbk	40AF66BA298D9807	2	7007	1	3
Verified	2020-04-17	Oliver Kruse	1F85835CA734F67B	2	6493	5	3
Verified	2024-07-01	kkmrkkblmbrbk	1F85835CA734F67B	2	7469	5	3

History

Date	User	Type	Result
2024-07-01	kkmrkkblmbrbk	C-PRP	M13187/156217263701497/1967289409 : 1F85835CA734F67B PRP: Verified PRP without proof (small exponent)
2023-10-10	-Anonymous-	NF-PM1	B1=100000000000, B2=122154521813133810
2023-05-17	JacobZ	NF-PM1	B1=8400000000, B2=34523926202766000
2022-02-05	Joss	NF-PM1	B1=1000000, B2=3910366209750
2020-04-17	Oliver Kruse	C-PRP	M13187/1967289409/156217263701497 : 1F85835CA734F67B PRP: Verified PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M13187/1967289409/156217263701497 : 40AF66BA298D9807 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M13187/1967289409/156217263701497 : 40AF66BA298D9807 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M13187/1967289409/156217263701497 : 40AF66BA298D9807 PRP without proof (not generated)
2008-08-29	-Anonymous-	F	Factor: 156217263701497