3 989 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
191473	6	17.5	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	13848 / 40830

Estimated T-Level: 51.7 ⓘ

TF below 2^167 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	7D1302F1556A9D20	1	0	1	3
Verified	2017-10-12	kkmrkkblmbrbk	7D1302F1556A9D20	1	1745	1	3
Verified	2020-04-17	Oliver Kruse	9CCCC77CBE71A851	1	2458	5	3
Verified	2024-02-03	Wentao Huang	9CCCC77CBE71A851	1	872	5	3

History

Date	User	Type	Result
2024-02-03	Wentao Huang	C-PRP	M3989/191473 : 9CCCC77CBE71A851 PRP: Verified PRP without proof (small exponent)
2023-03-23	mikr	NF-PM1	B1=500000000000, B2=2621504102555888550
2021-09-09	Jinyuan Wang	NF-PM1	B1=1300000000, B2=13000000000, E=12
2020-04-17	Oliver Kruse	C-PRP	M3989/191473 : 9CCCC77CBE71A851 PRP: Verified PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M3989/191473 : 7D1302F1556A9D20 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M3989/191473 : 7D1302F1556A9D20 PRP: Verified PRP without proof (not generated)
2017-09-21	Oliver Kruse	C-PRP	M3989/191473 : 7D1302F1556A9D20 PRP without proof (not generated)