11 621 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
836713	6	19.7	old
107378041	9	26.7	2008-08-26 19:58:35

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	06AA5643E68B17F8	2	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	06AA5643E68B17F8	2	10049	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	D1CFF9645B794A0A	2	6870	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	D1CFF9645B794A0A	2	2442	5	3

History

Date	User	Type	Result
2025-03-13	masser	NF-PP1	Start=199/71, B1=430000000, B2=429570000000
2025-02-27	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	M11621/107378041/836713 : D1CFF9645B794A0A
2023-01-20	-anonymous-	NF-PM1	B1=100000000000, B2=122192573512709700
2020-04-17	Oliver Kruse	C-PRP	M11621/836713/107378041 : D1CFF9645B794A0A
2017-10-12	kkmrkkblmbrbk	C-PRP	M11621/836713/107378041 : 06AA5643E68B17F8
2017-09-21	Oliver Kruse	C-PRP	M11621/836713/107378041 : 06AA5643E68B17F8
2017-09-21	Oliver Kruse	C-PRP	M11621/836713/107378041 : 06AA5643E68B17F8
2016-09-07	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12
2008-08-26	-anonymous-	F	Factor: 107378041