11 681 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
489652230008215458852991	24	78.7	old

P-1 factors

Date	Factors	B1	B2
2023-01-20	No new factors discovered	100000000000	122192573512709696

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	2109 / 9201

Estimated T-Level: 41.1 ⓘ

TF below 2^132 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	79BE844C66893F58	1	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	79BE844C66893F58	1	4165	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	43251C391E2D530D	1	7268	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	43251C391E2D530D	1	6135	5	3

History

Date	User	Type	Result
2025-03-13	masser	NF-PP1	Start=106/19, B1=430000000, B2=429570000000
2025-03-02	masser	NF-PP1	Start=6/5, B1=430000000, B2=429570000000
2025-01-22	masser	NF-PP1	Start=2/7, B1=430000000, B2=429570000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M11681/489652230008215458852991 : 43251C391E2D530D
2023-01-20	-anonymous-	F-PM1	Factor: 489652230008215458852991 / B1=100000000000, B2=122192573512709700
2020-04-17	Oliver Kruse	C-PRP	M11681/489652230008215458852991 : 43251C391E2D530D
2017-10-12	kkmrkkblmbrbk	C-PRP	M11681/489652230008215458852991 : 79BE844C66893F58
2017-09-21	Oliver Kruse	C-PRP	M11681/489652230008215458852991 : 79BE844C66893F58
2017-09-21	Oliver Kruse	C-PRP	M11681/489652230008215458852991 : 79BE844C66893F58
2016-09-07	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12