6 121 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
81237913	8	26.3	old
103648442454021825337	21	66.5	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	6420 / 16550

Estimated T-Level: 46.9 ⓘ

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	0BCFB077340FC5E6	2	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	0BCFB077340FC5E6	2	3720	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	CAD994634A6AED17	2	129	5	3
Verified	No proof (small exponent)	2024-02-03	Wentao Huang	CAD994634A6AED17	2	5215	5	3

History

Date	User	Type	Result
2025-03-17	masser	NF-PP1	Start=93/11, B1=1000000000, B2=999000000000
2025-03-09	masser	NF-PP1	Start=6/5, B1=1000000000, B2=999000000000
2025-02-28	masser	NF-PP1	Start=2/7, B1=1000000000, B2=999000000000
2024-02-03	Wentao Huang	C-PRP	M6121/81237913/103648442454021825337 : CAD994634A6AED17
2023-07-29	-anonymous-	NF-PM1	B1=40000000000, B2=169617550478676300
2021-07-09	ViliamF	NF-PM1	B1=1000000000, B2=201000000000
2020-04-17	Oliver Kruse	C-PRP	M6121/81237913/103648442454021825337 : CAD994634A6AED17
2017-10-12	kkmrkkblmbrbk	C-PRP	M6121/81237913/103648442454021825337 : 0BCFB077340FC5E6
2017-09-21	Oliver Kruse	C-PRP	M6121/81237913/103648442454021825337 : 0BCFB077340FC5E6
2017-09-21	Oliver Kruse	C-PRP	M6121/81237913/103648442454021825337 : 0BCFB077340FC5E6