1 237 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
2538207129840687799335203259492870476186248896616401346500027311795983	70	230.6	2010-11-02 15:07:02

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	105362 / 105362
65	800000000	108167 / 194238

Estimated T-Level: 62.8 ⓘ

TF below 2^204 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Unknown	5BE2	0
Verified (Factored)		George Woltman	DF5E6622F83F5BE2	0
Verified (Factored)		Gord Palameta	DF5E6622F83F5BE2	116

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-25	csaba	7F72EDA0088CF18E	1	0	1	3
Verified	2017-09-26	George Woltman	7F72EDA0088CF18E	1	37	1	3
Verified	2017-10-02	kkmrkkblmbrbk	7F72EDA0088CF18E	1	0	1	3
Verified	2020-04-17	Oliver Kruse	8E671C85179020B6	1	930	5	3
Verified	2020-08-12	_p95holder_	8E671C85179020B6	1	159	5	3

History

Date	User	Type	Result
2021-07-19	ViliamF	NF-PP1	Start=2/7, B1=1000000000, B2=221000000000
2021-03-27	nordi	NF-PM1	B1=1000000000000, B2=2232843418649129478
2020-08-12	_p95holder_	C-PRP	M1237/2538207129840687799335203259492870476186248896616401346500027311795983 : 8E671C85179020B6 PRP: Verified PRP without proof (small exponent)
2020-04-17	Oliver Kruse	C-PRP	M1237/2538207129840687799335203259492870476186248896616401346500027311795983 : 8E671C85179020B6 PRP: Verified PRP without proof (small exponent)
2017-10-02	kkmrkkblmbrbk	C-PRP	M1237/2538207129840687799335203259492870476186248896616401346500027311795983 : 7F72EDA0088CF18E PRP: Verified PRP without proof (not generated)
2017-09-26	George Woltman	C-PRP	M1237/2538207129840687799335203259492870476186248896616401346500027311795983 : 7F72EDA0088CF18E PRP: Verified PRP without proof (not generated)
2017-09-25	csaba	C-PRP	M1237/known_factors : 7F72EDA0088CF18E PRP: Verified PRP without proof (not generated)
2010-11-02	-Anonymous-	F-ECM	Factor: 2538207129840687799335203259492870476186248896616401346500027311795983
2010-06-22	anonymous	NF	no factor from 2^59 to 2^60
2010-06-14	chalsall	NF	no factor from 2^58 to 2^59
2008-10-22	Markus Tervooren	NF-PM1	B1=45000000000, B2=4500000000000, E=12