7 207 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
172969	6	17.4	old
151085282097257648071567	24	77.0	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	2500 / 16550

Estimated T-Level: 45.8 ⓘ

TF below 2^147 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	A8C8ECB188D9E32B	2	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	A8C8ECB188D9E32B	2	1236	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	4FC1E4B67EFBE765	2	2948	5	3
Verified	No proof (small exponent)	2024-02-03	Wentao Huang	4FC1E4B67EFBE765	2	2529	5	3

History

Date	User	Type	Result
2025-04-10	masser	NF-PP1	Start=162/19, B1=830000000, B2=829170000000
2025-03-22	masser	NF-PP1	Start=6/5, B1=830000000, B2=829170000000
2025-03-15	masser	NF-PP1	Start=2/7, B1=830000000, B2=829170000000
2024-02-03	Wentao Huang	C-PRP	M7207/172969/151085282097257648071567 : 4FC1E4B67EFBE765
2023-08-26	-anonymous-	NF-PM1	B1=34000000000, B2=142096338314180250
2021-12-16	ANONYMOUS	NF-PM1	B1=100000000
2020-04-17	Oliver Kruse	C-PRP	M7207/172969/151085282097257648071567 : 4FC1E4B67EFBE765
2017-10-12	kkmrkkblmbrbk	C-PRP	M7207/172969/151085282097257648071567 : A8C8ECB188D9E32B
2017-09-21	Oliver Kruse	C-PRP	M7207/172969/151085282097257648071567 : A8C8ECB188D9E32B
2017-09-21	Oliver Kruse	C-PRP	M7207/172969/151085282097257648071567 : A8C8ECB188D9E32B