7 643 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
15287	5	13.9	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	12109 / 16550

Estimated T-Level: 48.7 ⓘ

TF below 2^157 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	B1D7D4BFE49754C3	1	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	B1D7D4BFE49754C3	1	3121	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	AF5EAF043FD2F97C	1	1981	5	3
Verified	No proof (small exponent)	2022-05-12	Jorge Coveiro	AF5EAF043FD2F97C	1	3510	5	3

History

Date	User	Type	Result
2025-04-08	masser	NF-PP1	Start=82/13, B1=830000000, B2=829170000000
2025-03-31	masser	NF-PP1	Start=6/5, B1=830000000, B2=829170000000
2025-03-20	masser	NF-PP1	Start=2/7, B1=830000000, B2=829170000000
2024-12-10	yuriy_5-1	NF-PM1	B1=24000000000, B2=94941375721712520
2022-05-12	Jorge Coveiro	C-PRP	M7643/15287 : AF5EAF043FD2F97C
2021-07-08	ViliamF	NF-PM1	B1=1000000000, B2=201000000000
2020-04-17	Oliver Kruse	C-PRP	M7643/15287 : AF5EAF043FD2F97C
2017-10-12	kkmrkkblmbrbk	C-PRP	M7643/15287 : B1D7D4BFE49754C3
2017-09-21	Oliver Kruse	C-PRP	M7643/15287 : B1D7D4BFE49754C3
2017-09-21	Oliver Kruse	C-PRP	M7643/15287 : B1D7D4BFE49754C3