1 640 971 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
4243551007	10	32.0	old
151843041789208022969	21	67.0	2015-05-13 11:36:37

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-02	Oliver Kruse	75A40FA1DFE3E92A	2	0	1	3
Verified	2017-11-02	kkmrkkblmbrbk	75A40FA1DFE3E92A	2	545357	1	3

P-1 factors

Date	Factor	B1	B2
2015-05-13	151843041789208022969	500000	15000000

History

Date	User	Type	Result
2017-11-02	kkmrkkblmbrbk	C-PRP	M1640971/4243551007/151843041789208022969 : 75A40FA1DFE3E92A PRP: Verified PRP without proof (not generated)
2017-10-02	Oliver Kruse	C-PRP	M1640971/4243551007/151843041789208022969 : 75A40FA1DFE3E92A PRP: Verified PRP without proof (not generated)
2015-05-13	alpertron	F-PM1	Factor: 151843041789208022969 / (P-1, B1=500000, B2=15000000, E=12)