11 987 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
1193072443451321	16	50.1	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1796 / 9201

Estimated T-Level: 41.0 ⓘ

TF below 2^131 is very unlikely to find new factors due to ECM effort.

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	No proof (small exponent)	2017-09-21	Oliver Kruse	B84F334C6614BA65	1	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	B84F334C6614BA65	1	8914	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	F5E19CB0ACCA1EFE	1	3756	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	F5E19CB0ACCA1EFE	1	8998	5	3

History

Date	User	Type	Result
2025-03-09	masser	NF-PP1	Start=157/41, B1=430000000, B2=429570000000
2025-02-23	masser	NF-PP1	Start=6/5, B1=430000000, B2=429570000000
2025-01-21	masser	NF-PP1	Start=2/7, B1=430000000, B2=429570000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M11987/1193072443451321 : F5E19CB0ACCA1EFE
2023-04-06	-anonymous-	NF-PM1	B1=100000000000, B2=122192573512709700
2020-04-17	Oliver Kruse	C-PRP	M11987/1193072443451321 : F5E19CB0ACCA1EFE
2017-10-12	kkmrkkblmbrbk	C-PRP	M11987/1193072443451321 : B84F334C6614BA65
2017-09-21	Oliver Kruse	C-PRP	M11987/1193072443451321 : B84F334C6614BA65
2017-09-21	Oliver Kruse	C-PRP	M11987/1193072443451321 : B84F334C6614BA65
2016-09-07	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12
2011-02-05	Oscar Östlin	F	Factor: 1193072443451321