9 871 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
11503259261519	14	43.4	old
44711148715911350809	20	65.3	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	9201 / 9201
50	44000000	6755 / 16550

Estimated T-Level: 47.0 ⓘ

TF below 2^151 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	EC61F896FBA41605	2	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	EC61F896FBA41605	2	6050	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	FED8C2F96D3BAD92	2	5903	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	FED8C2F96D3BAD92	2	8455	5	3

History

Date	User	Type	Result
2025-03-19	masser	NF-PP1	Start=151/17, B1=1000000000, B2=999000000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M9871/11503259261519/44711148715911350809 : FED8C2F96D3BAD92
2023-06-13	JacobZ	NF-PM1	B1=58000000000, B2=241250667952694400
2022-11-25	Kevin_9611	NF-PM1	B1=1000000000, B2=100294988083290
2022-02-05	Joss	NF-PM1	B1=1000000, B2=6010952007060
2020-04-17	Oliver Kruse	C-PRP	M9871/11503259261519/44711148715911350809 : FED8C2F96D3BAD92
2017-10-12	kkmrkkblmbrbk	C-PRP	M9871/11503259261519/44711148715911350809 : EC61F896FBA41605
2017-09-21	Oliver Kruse	C-PRP	M9871/11503259261519/44711148715911350809 : EC61F896FBA41605
2017-09-21	Oliver Kruse	C-PRP	M9871/11503259261519/44711148715911350809 : EC61F896FBA41605