4 561 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
72977	5	16.2	old
287312273008223	15	48.0	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	16550 / 16550
55	110000000	15841 / 40830

Estimated T-Level: 51.9 ⓘ

TF below 2^168 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-21	Oliver Kruse	D46EDCAECC08D501	2	0	1	3
Verified	2017-10-12	kkmrkkblmbrbk	D46EDCAECC08D501	2	2662	1	3
Verified	2020-04-17	Oliver Kruse	4435F5FCAD1BCE82	2	1490	5	3
Verified	2024-02-03	Wentao Huang	4435F5FCAD1BCE82	2	3232	5	3

History

Date	User	Type	Result
2024-02-03	Wentao Huang	C-PRP	M4561/72977/287312273008223 : 4435F5FCAD1BCE82 PRP: Verified PRP without proof (small exponent)
2023-05-25	-Anonymous-	NF-PM1	B1=70000000000, B2=701928325533134700
2021-07-07	ViliamF	NF-PM1	B1=1000000000, B2=201000000000
2020-04-17	Oliver Kruse	C-PRP	M4561/72977/287312273008223 : 4435F5FCAD1BCE82 PRP: Verified PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M4561/72977/287312273008223 : D46EDCAECC08D501 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M4561/72977/287312273008223 : D46EDCAECC08D501 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M4561/72977/287312273008223 : D46EDCAECC08D501 PRP without proof (not generated)