2 287 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 3 known prime factors. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
153474544261464986969	21	67.1	old
2792258565674969889737	22	71.2	old
28725327118916416508854002142754538607150289	44	144.4	2011-12-19 13:17:09

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	40830 / 40830
60	260000000	61967 / 105362

Estimated T-Level: 57.9 ⓘ

TF below 2^187 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	0626CDFC63BECBE1	3	0	1	3
Verified	No proof (small exponent)	2017-10-02	kkmrkkblmbrbk	0626CDFC63BECBE1	3	0	1	3
Verified	No proof (small exponent)	2017-12-07	ATH	0626CDFC63BECBE1	3	1565	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	2CD2CEB03AA71E07	3	1831	5	3
Verified	No proof (small exponent)	2024-02-03	Wentao Huang	2CD2CEB03AA71E07	3	1538	5	3
Verified	No proof (small exponent)	2025-10-06	Dobri	2CD2CEB03AA71E07	3	276	5	3

History

Date	User	Type	Result
2025-10-06	Dobri	C-PRP	M2287/153474544261464986969/2792258565674969889737/28725327118916416508854002142754538607150289 : 2CD2CEB03AA71E07
2024-05-18	masser	NF-PM1	B1=100000000000, B2=54350607399338250
2024-02-03	Wentao Huang	C-PRP	M2287/153474544261464986969/2792258565674969889737/28725327118916416508854002142754538607150289 : 2CD2CEB03AA71E07
2022-11-09	BloodIce	NF-PM1	B1=1000000000000, B2=1005401155859100
2022-10-03	BloodIce	NF-PM1	B1=100000000000, B2=13332796697220
2022-08-30	BloodIce	NF-PM1	B1=10000000000, B2=6568061763162900
2021-08-27	H Michaelson	NF-PP1	Start=2/7, B1=10000000, B2=1000000000
2020-04-17	Oliver Kruse	C-PRP	M2287/153474544261464986969/2792258565674969889737/28725327118916416508854002142754538607150289 : 2CD2CEB03AA71E07
2017-12-07	ATH	C-PRP	M2287/153474544261464986969/2792258565674969889737/28725327118916416508854002142754538607150289 : 0626CDFC63BECBE1
2017-10-02	kkmrkkblmbrbk	C-PRP	M2287/153474544261464986969/2792258565674969889737/28725327118916416508854002142754538607150289 : 0626CDFC63BECBE1
2017-09-21	Oliver Kruse	C-PRP	M2287/known_factors : 0626CDFC63BECBE1
2016-09-08	kkmrkkblmbrbk	NF-PM1	B1=500000000, B2=50000000000, E=12
2011-12-19	Matthias Wurtinger	F-ECM	Factor: 28725327118916416508854002142754538607150289