5 531 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
940271	6	19.8	old
14639904343	11	33.8	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	10990 / 16550

Estimated T-Level: 48.3 ⓘ

TF below 2^156 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	C1B41CA77DD20040	2	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	C1B41CA77DD20040	2	1477	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	5CF7A600B82F4637	2	4668	5	3
Verified	No proof (small exponent)	2024-02-03	Wentao Huang	5CF7A600B82F4637	2	3174	5	3

History

Date	User	Type	Result
2025-05-13	masser	NF-PP1	Start=163/17, B1=2100000000, B2=2097900000000
2024-07-26	mikr	NF-PM1	B1=500000000000, B2=1235156303186695890
2024-02-03	Wentao Huang	C-PRP	M5531/940271/14639904343 : 5CF7A600B82F4637
2023-07-13	-anonymous-	NF-PM1	B1=45000000000, B2=181622797963056450
2022-01-26	Ethan O'Connor	NF-PM1	B1=1300000000
2021-12-16	Oliver Kruse	NF-PM1	B1=1000000000, B2=1002106985940060
2020-04-17	Oliver Kruse	C-PRP	M5531/940271/14639904343 : 5CF7A600B82F4637
2017-10-12	kkmrkkblmbrbk	C-PRP	M5531/940271/14639904343 : C1B41CA77DD20040
2017-09-21	Oliver Kruse	C-PRP	M5531/940271/14639904343 : C1B41CA77DD20040
2017-09-21	Oliver Kruse	C-PRP	M5531/940271/14639904343 : C1B41CA77DD20040