4 950 287 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
1828768745440735830900984469921	31	100.5	2014-12-28 13:48:15

ECM

Digits	B1	Curves
25	50000	6 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1998-09-27	Jamie Chiou	1CAF8F85FEB4B859	0
Verified (Factored)	2000-06-11	Eric Strand	1CAF8F85FEB4B859	3936385

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-20	kkmrkkblmbrbk	CFE7A6E433052BF9	1	0	1	3
Verified	2018-04-16	ATH	CFE7A6E433052BF9	1	4513307	1	3

P-1 factors

Date	Factor	B1	B2
2014-12-28	1828768745440735830900984469921	1200000	39750000

History

Date	User	Type	Result
2018-04-16	ATH	C-PRP	M4950287/1828768745440735830900984469921 : CFE7A6E433052BF9 PRP: Verified PRP without proof (not generated)
2017-09-20	kkmrkkblmbrbk	C-PRP	M4950287/1828768745440735830900984469921 : CFE7A6E433052BF9 PRP: Verified PRP without proof (not generated)
2014-12-28	mikr	F-PM1	Factor: 1828768745440735830900984469921 / (P-1, B1=1200000, B2=39750000, E=12)
2011-08-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-07-20	USAFSS	NF-PM1	B1=60000, B2=960000, E=6
2009-12-31	markr	NF	no factor from 2^61 to 2^62