8 831 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
164856377760300429239292726292199519	36	117.0	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	8241 / 16550

Estimated T-Level: 47.5 ⓘ

TF below 2^153 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	51C870B5B03BAC79	1	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	51C870B5B03BAC79	1	627	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	3CB779F2F069DC6C	1	1814	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	3CB779F2F069DC6C	1	7545	5	3

History

Date	User	Type	Result
2025-04-28	masser	NF-PP1	Start=111/53, B1=1000000000, B2=999000000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M8831/164856377760300429239292726292199519 : 3CB779F2F069DC6C
2023-08-05	JacobZ	NF-PM1	B1=66000000000, B2=254680416808818000
2020-04-17	Oliver Kruse	C-PRP	M8831/164856377760300429239292726292199519 : 3CB779F2F069DC6C
2017-10-12	kkmrkkblmbrbk	C-PRP	M8831/164856377760300429239292726292199519 : 51C870B5B03BAC79
2017-09-21	Oliver Kruse	C-PRP	M8831/164856377760300429239292726292199519 : 51C870B5B03BAC79
2017-09-21	Oliver Kruse	C-PRP	M8831/164856377760300429239292726292199519 : 51C870B5B03BAC79
2003-02-24	-anonymous-	NF-PM1	B1=4290000000
2002-12-16	-anonymous-	NF	no factor TF: 1-57
2002-10-26	-anonymous-	NF-PM1	B1=3221225472, B2=4290000000, E=48
2002-08-31	-anonymous-	NF-PM1	B1=2147483648, B2=4290000000, E=48
2002-06-15	-anonymous-	NF-PM1	B1=1073741824, B2=4290000000, E=48
2001-09-10	-anonymous-	NF-PM1	B1=3000000000, B2=4290000000
2001-06-23	-anonymous-	NF-PM1	B1=43000000, B2=4290000000
2001-02-11	-anonymous-	NF-PM1	B1=1000000, B2=100000000
2000-07-25	-anonymous-	NF	no factor TF: 1-56
2000-03-01	-anonymous-	NF	no factor TF: 54-55
1999-12-30	-anonymous-	NF	no factor TF: 53-54
1999-09-22	-anonymous-	NF	no factor TF: 52-53